For American applicants for 2027 entry. Cambridge interviews between 7 and 18 December 2026, and from the United States almost every College interviews online.
Choose your Natural Sciences pack — £180 eachCambridge interviews Natural Sciences applicants between 7 and 18 December 2026. In the 2025 cycle the course ran at 5 applications per place and accepted 576 students, and it is taught at every College — Cambridge’s own key-information panel gives its “Study at” value as “All Colleges”. Across all courses, 597 applications came from the United States that cycle, 64 received offers and 33 accepted, a success rate of 5.5%.
Those are the numbers every page gives you. This one is about a sentence instead. Cambridge’s course page says: “Your choice of application stream, and the courses that you are currently studying, will affect the types of questions that are asked at interview.” It is written for a British applicant, for whom “the courses that you are currently studying” means three or four A levels with published subject content. For you it means an AP transcript — and the College Board publishes, in its own course frameworks, a precise account of what each of those APs does and does not assess.
Read the two documents against each other and a US application to Natural Sciences stops being a question of grades. It becomes a question of which five APs you hold, which three first-year subjects they open, and which specific topics your framework has told the examiner not to ask you about.
Seven Natural Sciences packs, three free samples
Our Natural Sciences practice runs across seven packs at £180 each, every one ten of our own practice questions in the style of the interview, with prompts and a worked answer, written by specialist tutors. Biology, chemistry and physics each have a free sample — a separate download for each subject badge — so you can read one of our questions before choosing.
See the seven packs and the free samplesEverything here is for 2027 entry and was checked at source in September 2026 against Cambridge’s own course, entry-requirements and interview pages, the Natural Sciences Tripos department site, and the College Board’s own course and exam descriptions for AP Chemistry, AP Biology, AP Calculus AB and BC, and the two AP Physics C courses. Where this page says a framework does not cover something, that is read off the framework’s own unit list or its own exclusion statement, never off a keyword search. Your interview invitation governs your own case.
Every Natural Sciences applicant declares a stream. Cambridge is direct about it: “When you apply, you’ll need to tell us whether you’re interested in Biological or Physical Sciences. We use this information in the admissions process.” The Natural Sciences Tripos explains what the declaration actually does inside a College: “If selected for interview, the choice helps a College assign biological or physical sciences interviewers.”
So the stream picks who sits opposite you, and your current courses pick what they can reasonably open with. Cambridge spells out the logic in its advice to British applicants: “It is best to apply for Physical Sciences if you have studied Physics and Maths A levels. This is because your interview will be on subjects that you have already studied.”
That last clause is a promise and a constraint at once. An interviewer will not ambush you with a topic you have never met. But they will assume the topics your qualification says you have met — and an AP course and an A level in the same subject do not certify the same thing. The rest of this page is the comparison nobody on the results page for this question has made.
Cambridge opens its United States guidance with a line that surprises most families: “Completion of a US High School Diploma alone is not considered suitable preparation for entry.” What it wants instead is a combination. Typically, suitable evidence of preparation would comprise “a minimum of 5 Advanced Placement (AP) Scores at grade 5 in subjects related to the course applied for”, plus a high score on the SAT or ACT, plus a high overall GPA.
The clause doing the work there is in subjects related to the course applied for. Five 5s spread across US History, Psychology, Statistics, English Literature and Environmental Science is five 5s; it is not five 5s related to Natural Sciences. And Cambridge tells you separately what the course needs: Mathematics, plus “2 other science or mathematics subjects (Biology, Chemistry, Physics, and, for A level only, Further Mathematics)”.
The standardised-test bars name Natural Sciences explicitly. Alongside APs you need a combined SAT of at least 1,500 with Mathematics at 750 or above, or an ACT composite of 33 out of 36. There is a second ACT condition printed a line below the first, and it is easy to miss: “Students applying for Science courses should also achieve an ACT Science Score of at least 33.” A composite of 33 reached on the strength of English and Reading does not satisfy it.
Three further rules shape a portfolio. Standardised tests “should have been achieved within 2 years of matriculation”, which rules out a sophomore-year AP for anyone deferring entry. AP Capstone is welcomed, but “AP Capstone scores will not usually count towards the requirements for 5 or more scores of 5” — so a portfolio that reaches five only by counting Seminar and Research does not reach five. And every AP, SAT and ACT score you have ever taken must be disclosed, retakes included, with Colleges reserving the right to confirm results with College Board, ACT or your school.
Here is the part almost nothing written for American applicants explains. Natural Sciences is not a single syllabus. The Tripos puts it plainly: “In the first year all students choose three experimental subjects, and one mathematics subject.” There are seven experimental options and two mathematics courses, and the department publishes a subject requirement against each option.
Those requirements are written in A levels. Set them beside what Cambridge says it accepts from an American and the picture is this.
| First-year option | What the Tripos requires | What that asks of a US portfolio |
|---|---|---|
| Chemistry | Essential: A Level Chemistry | AP Chemistry. Cambridge publishes no preferred AP substitute here, so the general rule applies — a score of 5, in a subject related to the course. |
| Physics | Essential: A Level Physics or Further Mathematics, including the section on Mechanics. Students will be required to take IA Mathematics. | The two Physics C tests are what Cambridge says it prefers where a course asks for Physics A level. Taking this option also forces your mathematics choice. |
| Materials Science | Essential: A Level in Chemistry or Physics | Either physical science will do, so this is the widest door for a portfolio strong in one and thin in the other. |
| Earth Sciences | No previous subject knowledge is necessary | Open to every applicant whatever the transcript says. There is a required Year 1 field course. |
| Biomedical Sciences | Highly desirable: A Level Biology | AP Biology. Note the wording is highly desirable rather than essential — a different bar from Chemistry’s. |
| Biomolecules and Cells | Recommended: A Level Biology | AP Biology, at the softest of the three biology bars. |
| Biodiversity, Evolution and Ecology | Recommended: A Level Biology | AP Biology, same bar. |
Source: the Natural Sciences Tripos’s own admissions page, A Level subject requirements for first year courses, and the University’s international entry requirements, both read 24 September 2026. A Psychology-focused first-year option is also available subject to timetable and numbers, and needs no previous subject knowledge.
Read down the third column and the point lands. Your five APs are not only an admissions bar. They are the list of first-year subjects available to you, and therefore the list of things an interviewer can reasonably open a conversation about. A portfolio with AP Chemistry and AP Biology but no physics reaches five options. One with the two Physics C tests and no AP Chemistry reaches four, and cannot take Part IA Chemistry at all.
One limit on all of this, stated plainly because it matters. Cambridge publishes these as first-year option requirements. It does not say anywhere that a College checks an applicant’s AP portfolio against them when deciding whom to admit, and this page does not imply that it does. What the table tells you is what your portfolio opens once you are there — which is also, usefully, a map of the ground an interviewer already knows you have covered.
Cambridge has a short section headed “Choosing AP Tests”. It runs to four sentences. The first points you at the course pages to identify close subject matches. The last notes that AP Tests do not have to be completed in a single sitting. Between them sit the only two subject-specific preferences the University publishes:
“For Cambridge courses that ask for Mathematics and Further Mathematics A level, we strongly prefer you to take AP Calculus BC.”
“For courses that ask for Physics A level, we prefer you to take the 2 Physics C Tests — AP Physics C: Electricity and Magnetism, AP Physics C: Mechanics.”
There is no third. Read the whole section and it names no preferred AP substitute for Chemistry, and none for Biology — the two subjects most Natural Sciences applicants actually offer. That is an absence in a short published list rather than an absence in the world: it means Cambridge has not singled out a chemistry or biology route, so for those subjects you fall back on the general rule of a 5 in a subject related to the course, and on whatever your shortlisted Colleges advise.
The Physics preference is worth pausing on, because it points at the narrowest pairing on the AP physics menu for topic coverage. The AP Physics C: Mechanics framework is seven units, running from Kinematics to Oscillations. AP Physics C: Electricity and Magnetism is six, Units 8 to 13, all of them electrical or magnetic. Between those thirteen units there is no thermodynamics unit, no waves or optics unit, no fluids unit and no modern-physics unit. The calculus is an advantage and Cambridge says so by preferring them; the topic span is not. Our Oxbridge Physics interview page for US applicants maps all four AP physics courses topic by topic against the ESAT syllabus, and there is no point repeating that work here.
One line in Cambridge’s US guidance is worth more to a senior in September than anything else on the page: “If you’re attending a school that offers fewer than 5 APs, you should self-enrol onto additional AP tests to meet/surpass Cambridge AP entry requirements. AP Tests can be taken without completing the relevant AP Course.”
That changes the shape of the problem. If your school runs no AP Chemistry, or you dropped physics after sophomore year, or your five APs are five but only three are related to the course, you are not looking at a timetable you cannot change. You are looking at a registration deadline. Cambridge has said in its own words that the test is what it wants and the course is not a precondition of sitting it. It also tells you the pending test should be listed in the Education History section of the UCAS application, since academic entry requirements do not have to be met at the point of submission — you need to be on track to meet or exceed them by the end of your final year.
AP Chemistry is nine units. In the framework’s own exam-weighting table they are Atomic Structure and Properties, Compound Structure and Properties, Properties of Substances and Mixtures, Chemical Reactions, Kinetics, Thermochemistry, Equilibrium, Acids and Bases, and Thermodynamics and Electrochemistry. Not one of them is organic chemistry. That is not an inference from a word search: it is the list of units the course contains.
More useful still, the framework carries exclusion statements — the College Board writing down, topic by topic, what its exam will not ask. Six of them land squarely on the ground a Cambridge chemistry interviewer stands on.
| Unit | What the framework says will not be assessed | Why a Cambridge interviewer might reach for it |
|---|---|---|
| Kinetics | “Calculations involving the Arrhenius equation will not be assessed on the AP Exam.” | Temperature dependence of rate is the standard follow-up to any rate-law question. |
| Acids and Bases | “Lewis acid-base concepts will not be assessed on the AP Exam.” The framework adds that the emphasis is on reactions in aqueous solution. | Electron-pair donation is the language most inorganic and organic reasoning is conducted in. |
| Compound Structure and Properties | The exam “will neither explicitly assess molecular orbital diagrams, filling of molecular orbitals, nor the distinction between bonding, nonbonding, and antibonding orbitals”. | Molecular orbital reasoning is how a bonding question at Cambridge usually turns interesting. |
| Compound Structure and Properties | “An understanding of the derivation and depiction of hybrid orbitals will not be assessed on the AP Exam.” Sigma and pi bonding, VSEPR shapes and sp, sp2 and sp3 nomenclature are included. | You have the labels and the shapes; the derivation behind them is the part left untested. |
| Thermochemistry | “The concept of state functions will not be assessed on the AP Exam.” | It is the idea that organises every enthalpy cycle you have already been taught to calculate. |
| Properties of Substances and Mixtures | “interpreting phase diagrams will not be assessed on the AP Exam” — the framework prints it as “Understanding/ interpreting”, split across a line. | A phase diagram is a cheap way to start a conversation about equilibrium and intermolecular forces. |
Source: College Board, AP Chemistry Course and Exam Description, Course Framework V.1, read from the published PDF on 24 September 2026. The framework carries 26 exclusion statements in total; these six are the ones bearing on a Cambridge Natural Sciences interview.
None of this means an AP chemist is unprepared. It means something more precise and more useful: there is a published, named list of things your qualification has certified you were not examined on, and every item on it is a plausible opening for an interviewer who has been told you study chemistry. An hour on the Arrhenius equation and an hour on Lewis acids is a better use of October than another pass through equilibrium.
Practise the chemistry your framework excluded — £180 each
Two packs sit directly on the six AP Chemistry exclusions above. Each is ten of our own practice questions in the style of the interview, with prompts and a worked answer, written by specialist tutors.
A free Chemistry sample shows the format first. It is a separate download belonging to the Chemistry badge, not part of either pack.
AP Biology’s eight units are Chemistry of Life, Cells, Cellular Energetics, Cell Communication and Cell Cycle, Heredity, Gene Expression and Regulation, Natural Selection, and Ecology. It is a strong, modern, molecular course, and a Biological Sciences interviewer will find plenty of common ground in it. What its own unit list does not contain is a physiology option — there is no organ-systems unit, and the human body appears as cells and signalling rather than as kidneys, hearts and nerves.
Two exclusion statements sharpen that further, and both sit in Cellular Energetics:
A British applicant arrives having learned glycolysis step by step, with the enzymes named. You arrive understanding what the pathway is for, which is arguably the better education and is certainly not what an interviewer will assume. The same goes for thermodynamics: you can be asked why a reaction goes, and the equation that answers it has been formally excluded from your exam.
Cambridge’s published profile of Biological entrants is worth holding alongside this. Among those who studied A levels and started in 2018, 2019 and 2023, 98% had taken Biology, 97% Chemistry and only 29% Physics — so the Biological stream is, in practice, a chemistry-heavy route. If your APs are Biology, Chemistry, Calculus BC and two others, you are closer to the standard shape of a Biological application than the stream’s name suggests.
Every Natural Sciences student takes a mathematics subject in the first year, and the Tripos publishes what each contains. Mathematics for Physical Sciences “must be taken if a student takes Physics in the first year” — so choosing one of the seven experimental options also settles this. Its content, in the department’s own description, “includes lectures on vector calculus, vector algebra, matrices, complex numbers, ordinary and partial differential equations, elementary probability theory, and computing techniques”.
Now put AP Calculus BC next to it. The framework is ten units: Limits and Continuity; Differentiation, twice; Contextual and then Analytical Applications of Differentiation; Integration and Accumulation of Change; Differential Equations; Applications of Integration; Parametric Equations, Polar Coordinates and Vector-Valued Functions; and Infinite Sequences and Series. The last two are marked bc only in the table, which is precisely why Cambridge says it strongly prefers BC over AB: an AB candidate has neither series nor vector-valued functions.
BC is a strong preparation, and on differential equations and series it is ahead of where a UK A level leaves a student. But the first three items Cambridge lists for Mathematics for Physical Sciences — vector calculus, vector algebra, matrices — are not units of AP Calculus BC, and neither are complex numbers. Cambridge’s other mathematics course, Mathematics for Biological Sciences, is the Biological-route default and also opens the door to Chemistry and Earth Sciences later in the degree.
Two honest caveats. This is a statement about what the AP framework certifies, not about what you know: plenty of American applicants take multivariable calculus or linear algebra at a local college, and nothing here can see that. And it is not a warning — the Tripos says a student concerned about their mathematical background should discuss it with their Director of Studies. It is simply worth knowing which three words on a Cambridge lecture list are the ones your transcript does not speak to.
Every Natural Sciences applicant sits the Engineering and Science Admissions Test at an authorised centre, with advance registration. The requirement for this course is Mathematics 1 plus any two modules chosen from Biology, Chemistry, Physics and Mathematics 2. Each module is 40 minutes and 27 multiple-choice questions, making 120 minutes for most candidates, and there is no pass or fail and no penalty for a wrong answer.
The stream you declare does not restrict the choice. The Tripos answers the question directly: “In short — it doesn’t! You have free choice when you sign up for the assessment. We see applicant portfolios with a range of combinations in both routes, and no particular combination is uniquely advantageous. We advise that you select the sections that best align with your current studies.”
For a British applicant that advice is nearly automatic — the modules are named after A levels. For you it is a real decision, and the frameworks above are what it turns on. If your science APs are Chemistry and Biology, those two modules align with what you have actually been examined on. If you hold the two Physics C tests and Calculus BC, Physics and Mathematics 2 align better than a chemistry module ever will. The mistake to avoid is choosing a module because it sounds like the stream you declared; Cambridge has just told you the stream is not the criterion.
The Tripos frames the declaration as a description rather than a commitment: “We recommend you choose the entry route that best aligns to your strengths in your current studies (and therefore also likely indicates the first year choices you might make).” It does not restrict your first-year options, and you do not choose your specialism until you arrive.
Cambridge’s published entrant profiles give the shape of each route, with its own cohort qualifier attached. Among Natural Sciences (Physical) students who had studied A levels and started in 2018, 2019 and 2023, 97% achieved at least A*A*A*, all took Mathematics, 97% took Physics, 92% took Further Mathematics and 89% took Chemistry, with only 9% taking Biology. The Biological figures run the other way: 76% at A*A*A* or better, 98% Biology, 97% Chemistry, 29% Physics.
Translate that into an AP portfolio and the answer is usually obvious. Calculus BC plus the two Physics C tests, with or without Chemistry, is a Physical application. Biology plus Chemistry plus Calculus is a Biological one. The genuinely awkward case is Chemistry-plus-Biology-plus-Physics-plus-Calculus BC, which fits both — and there the Tripos’s own advice, align it to your strengths, is the whole of the answer. Whichever you pick, remember what it buys: it decides which pair of interviewers a College sits you in front of.
Oxford publishes separate single-subject science degrees rather than a combined Natural Sciences course. Physics, Chemistry, Biology and Biomedical Sciences each have their own entry, and an application commits you to one of them. Cambridge lets you carry three experimental subjects into the first year and specialise afterwards; Oxford asks you to decide first.
For an American weighing both, that is the structural difference that matters, and it interacts with everything above. If your portfolio is broad — Chemistry, Biology, Physics, Calculus BC — Cambridge rewards the breadth and Oxford asks you to spend it on one subject. If it is deep in one science, an Oxford single-subject course may suit it better. The AP-by-AP comparison for the physics case is on our USA Physics interview page, and the USA Oxbridge interview pillar covers the December timetable, the callback clock and the odds for both universities.
Cambridge’s main interview period for 2027 entry is 7 December to 18 December 2026, with a winter-pool round around mid to late January 2027. Most applicants have one or two interviews totalling 35 minutes to an hour.
Format is a College matter, not a University one. Four Colleges interview everyone in person, overseas applicants included: Churchill, Emmanuel, King’s and Selwyn. Clare’s in-person exception covers Medicine and Music, so a Natural Sciences applicant to Clare is online. And there is one College that singles this course out — Jesus interviews Natural Sciences (Physical) in person, but only for UK-based applicants, and interviews applicants based outside the UK online. The single Cambridge College that treats your course differently does not treat you differently.
The December ACT falls on Saturday 12 December, inside the fortnight. Cambridge’s application form has a field in which to say you are unavailable, and it names exams among the reasons it accepts; that question, and the one asking which country and time zone you will be in, have been on the form since the 2025-entry cycle, so they are not new and no competitor claiming otherwise is right. The USA pillar sets out the whole clock, and our guide for applicants outside the UK covers the December rules that apply wherever you are.
One last thing, in Cambridge’s words rather than ours: “Some companies offer interview preparation for a fee. These services are not endorsed by the University. They do not have access to any exclusive information.” That includes us. Nobody outside the Colleges has the real questions, and anyone who tells you otherwise is selling you something that does not exist.
Five things, in this order.
That last line is the one worth acting on. Every other applicant is revising what their course covered. The published exclusion statements tell you, by name, what it did not.
Seven Natural Sciences packs — £180 each
Each pack is ten of our own practice questions in the style of the interview, with prompts and a worked answer, written by specialist tutors. Pick by the stream you declared, then by the exclusion that applies to you. We publish 30 packs across 17 subjects at £180 each.
Physical stream
Biological stream
Free samples: chemistry, biology and physics — three separate downloads, one for each of those subject badges, and three of the nine subjects that have one. See every pack on the hub →
Yes, with conditions it publishes. Cambridge says a US High School Diploma alone is not considered suitable preparation for entry, and that a suitable American application typically shows a minimum of 5 Advanced Placement Scores at grade 5 in subjects related to the course applied for, a high score on the SAT or ACT, and a high overall GPA. For Natural Sciences specifically it names a combined SAT of 1,500 with Mathematics 750 or above, or an ACT composite of 33 out of 36, and adds that science applicants should also achieve an ACT Science Score of at least 33. AP Capstone scores will not usually count towards the five.
Cambridge requires Mathematics plus two other science or mathematics subjects from Biology, Chemistry, Physics and Further Mathematics, so your APs have to cover those. It publishes exactly two subject-specific preferences in its Choosing AP Tests section: AP Calculus BC where a course asks for Mathematics and Further Mathematics A level, and the two Physics C tests, Mechanics and Electricity and Magnetism, where a course asks for Physics A level. That section names no preferred substitute for Chemistry or for Biology, so for those two you are on the general rule of five scores of 5 in related subjects.
Cambridge answers this in one sentence. If you are attending a school that offers fewer than 5 APs, it says, you should self-enrol onto additional AP tests to meet or surpass its AP entry requirements, and it adds that AP Tests can be taken without completing the relevant AP Course. A missing subject is therefore a registration problem rather than a timetable problem. Two limits apply: standardised tests should have been achieved within 2 years of matriculation, and every AP, SAT and ACT score you have taken must be disclosed, retakes included.
In the first year all students choose three experimental subjects and one mathematics subject, and the Natural Sciences Tripos publishes a subject requirement against each first-year option. Chemistry lists A Level Chemistry as essential. Physics lists A Level Physics or Further Mathematics including the section on Mechanics as essential, and requires IA Mathematics alongside it. Materials Science takes Chemistry or Physics. Earth Sciences needs no previous subject knowledge at all. Biology-side options list A Level Biology as recommended, or highly desirable for Biomedical Sciences.
The AP Chemistry framework carries explicit exclusion statements, and six of them fall on material a Cambridge chemistry interviewer can reach for. Calculations involving the Arrhenius equation will not be assessed. Lewis acid-base concepts will not be assessed. The exam will neither explicitly assess molecular orbital diagrams, filling of molecular orbitals, nor the distinction between bonding, nonbonding and antibonding orbitals. An understanding of the derivation and depiction of hybrid orbitals will not be assessed. The concept of state functions will not be assessed. Interpreting phase diagrams will not be assessed.
It covers a great deal of it, and the framework is explicit about two places it stops. AP Biology states that students will need to understand the concept of energy, but the equation for Gibbs free energy is beyond the scope of the AP Exam, and that the specific steps, names of enzymes and intermediates of respiration and photosynthesis are beyond the scope of the course and the exam. Its eight units are Chemistry of Life, Cells, Cellular Energetics, Cell Communication and Cell Cycle, Heredity, Gene Expression and Regulation, Natural Selection and Ecology, so organ physiology is not among them.
Natural Sciences requires ESAT Mathematics 1 plus any two modules chosen from Biology, Chemistry, Physics and Mathematics 2, and the stream you declare does not restrict that choice. The Natural Sciences Tripos says it sees applicant portfolios with a range of combinations in both routes, that no particular combination is uniquely advantageous, and that it advises you to select the sections that best align with your current studies. For an American that means the AP transcript. Each module is 40 minutes and 27 multiple-choice questions, and there is no pass or fail.
At most Colleges, no. Four Colleges interview everyone in person: Churchill, Emmanuel, King's and Selwyn. Clare's in-person exception covers Medicine and Music, not Natural Sciences. Jesus interviews Natural Sciences (Physical) in person only for UK-based applicants and interviews applicants based outside the UK online. The main interview period is 7 December to 18 December 2026, with a winter-pool round in mid to late January 2027, and your invitation is the document that governs your own case.
Oxford publishes separate single-subject science degrees rather than a combined Natural Sciences course: Physics, Chemistry, Biology and Biomedical Sciences each have their own entry, and you apply to one of them. The practical difference for an American is that Cambridge lets you carry three experimental subjects into the first year and specialise later, while an Oxford application commits you at the point of applying. Our Oxbridge Physics interview page for US applicants sets out how the AP physics courses map onto what an Oxford Physics interviewer assumes.
No, and Cambridge says so plainly: some companies offer interview preparation for a fee, these services are not endorsed by the University, they do not have access to any exclusive information, and all official guidance is available free on its own website and official channels. That applies to us too. Nobody outside the Colleges has the real questions. What written practice can honestly offer is unfamiliar problems in the style of the interview, to reason through out loud before December.
The USA Oxbridge interview pillar covers the December timetable, the callback clock and the odds; applying from outside the UK covers what every overseas applicant has to settle. For the interview itself, our Physical-stream guide and Biological-stream guide take each route from the ESAT into December, and Natural Sciences interview questions by track carries worked examples with model answers. The Singapore Natural Sciences page runs the same comparison against the H2 syllabus, and USA Physics maps the four AP physics courses against the ESAT.
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