Practical guidance from the Leading Tuition team
Book a Free ConsultationCommon Entrance at 13+ is the shared examination set by the Independent Schools Examinations Board (ISEB) and used by the majority of independent senior schools in England and Wales as part of their admissions process. It is sat in May or June of Year 8, when pupils are typically 13 years old. While the papers themselves are standardised, the marks required vary considerably from school to school — which is why understanding both the syllabus and individual school thresholds is so important.
The ISEB English papers assess two distinct skills: comprehension and composition. These are examined separately, and schools may weight them differently when reviewing a candidate's overall performance.
The comprehension paper presents one or more unseen passages — typically a mix of fiction and non-fiction — and asks pupils to demonstrate close reading skills. Questions range from retrieval and inference to language analysis, where pupils are expected to comment on a writer's word choices and their effect on the reader. Marks are awarded for accuracy, relevance and the quality of explanation.
The composition paper requires pupils to produce one or more pieces of extended writing. Tasks may include descriptive writing, narrative writing, or a response to a stimulus. Examiners look for a clear sense of voice, structural control, varied vocabulary, and accurate punctuation and grammar. A common mistake is prioritising ambitious vocabulary at the expense of sentence-level accuracy — schools want to see both.
Across both papers, a mark of around 60% is generally considered a pass, 65% is solid, and 70% or above places a pupil in distinction territory. However, selective schools will expect candidates to perform consistently well in English, as it signals broader academic readiness.
The ISEB Mathematics syllabus at 13+ is broad and covers content that many pupils will recognise from Key Stage 3 — but at a depth that requires careful preparation. The syllabus is divided into three main areas: number and algebra, geometry and measures, and statistics and probability.
Within algebra, pupils are expected to work with expressions, equations, sequences and simple functions. Geometry covers angles, area, volume, transformations and coordinate geometry. Statistics includes reading and interpreting data from charts, tables and graphs, as well as basic probability.
The examination is typically split into two papers: one where a calculator is not permitted, and one where it is. The non-calculator paper is where many pupils lose marks unnecessarily — errors in mental arithmetic, fractions and negative numbers are particularly common. On the calculator paper, the risk shifts to method: pupils who reach for the calculator too quickly sometimes skip working that would earn them method marks even if the final answer is wrong.
Pupils aiming for schools with higher thresholds should pay particular attention to algebra and problem-solving questions, which tend to differentiate candidates at the top end of the mark range. Working through Common Entrance past papers and 13+ preparation resources is one of the most effective ways to identify gaps and build exam technique before May.
Science at Common Entrance 13+ can be sat as a single combined paper or as three separate papers covering Biology, Chemistry and Physics. The choice depends on what the receiving school requests — candidates should confirm this with their senior school well in advance of the examination.
The Biology paper covers topics including cells, nutrition, the human body, ecosystems and genetics at an introductory level. Chemistry includes the periodic table, chemical reactions, acids and bases, and materials. Physics covers forces, energy, electricity, waves and space.
Across all three sciences, questions test both factual recall and the ability to apply knowledge to unfamiliar contexts. Pupils are also expected to demonstrate scientific method — understanding variables, drawing conclusions from data, and evaluating experimental design. These applied questions are where well-prepared candidates can pull ahead.
One practical point worth noting: pupils at prep schools that follow the ISEB curriculum closely will have covered the majority of this content by the end of Year 8. Those who have followed a different curriculum — or who have had gaps in their science teaching — may need additional support to ensure full syllabus coverage.
Beyond the core subjects, Common Entrance offers papers in French, History, Geography, Religious Studies, Latin, Greek, Spanish and German. Not all schools require all subjects — again, candidates must check which papers their senior school expects.
French at 13+ is assessed across four skills: listening, reading, writing and speaking. The listening and reading papers test comprehension of authentic-style material, while the writing paper requires pupils to produce structured responses in French. The speaking component is conducted at the prep school and assessed by the class teacher. Pupils who have had consistent French teaching from Year 3 or 4 onwards are generally well placed, though vocabulary breadth and verb conjugation accuracy are common stumbling blocks.
History and Geography papers are essay-based and reward pupils who can structure an argument, use specific evidence, and demonstrate genuine understanding rather than rote-learned facts. History topics at 13+ typically include medieval England, the early modern period, and the twentieth century, depending on what the prep school has taught. Geography covers physical and human geography, with an emphasis on case studies and data interpretation.
Religious Studies follows a similar essay-based format, drawing on Christianity and at least one other world religion, as well as ethical and philosophical questions.
This is where Common Entrance becomes more nuanced. The ISEB sets the papers, but each senior school sets its own mark requirements — and some weight subjects differently or combine CE performance with interview scores, school reports and pre-test results. The table below gives a general guide to what several well-known schools expect.
| School | Minimum CE Mark | Notes |
|---|---|---|
| Eton College | 70%+ across core subjects | Conditional place confirmed via ISEB pre-test in Year 6; CE performance must meet the threshold set at registration |
| Harrow School | 65%+ | Interviews are also weighted alongside CE marks; overall profile considered |
| Winchester College | Does not use standard CE | Sets its own entrance examination; entirely separate from the ISEB CE syllabus |
| Marlborough College | 60–65% | CE results considered alongside interview performance |
| Rugby School | 60% | CE mark reviewed together with a report from the current school |
| Sherborne School | 60%+ | Standard CE accepted; scholarship candidates sit additional papers |
As a general rule, 60% is the minimum pass mark at most schools, 65% represents a comfortable pass, and 70% or above is distinction level. Highly selective schools such as Eton expect candidates to reach or exceed 70% consistently across core subjects. It is worth remembering that CE marks are not standardised across schools — a 65% at one school carries the same raw meaning as a 65% at another, but the threshold that school sets determines whether that mark is sufficient.
Not every independent senior school uses the ISEB Common Entrance papers. A significant number — including some of the most academically selective — set their own entrance examinations instead.
Winchester College is the most prominent example. The Winchester College entrance examination is entirely separate from the CE syllabus and is widely regarded as more demanding in its approach to reasoning and extended writing. Pupils applying to Winchester need to prepare specifically for these papers rather than following the standard ISEB curriculum.
Charterhouse uses CE for most candidates but sets its own papers for scholarship applicants. These scholarship papers go considerably beyond the standard CE syllabus and are designed to identify exceptional academic ability.
At Eton College, the King's Scholars sit a separate scholarship examination — the King's Scholarship — which is distinct from both the standard CE papers and the pre-test. It is one of the most competitive scholarship examinations at 13+ in the country.
For families whose child is applying to a school that sets its own papers, it is essential to obtain specimen papers directly from the school and to begin preparation well before the Year 8 examination window. The content and style can differ substantially from ISEB CE, and generic CE preparation alone will not be sufficient.
Are CE marks standardised across all schools, so that 65% means the same thing everywhere?
The raw mark percentages are consistent — a 65% on an ISEB paper means the same thing in terms of the questions answered correctly. However, each school sets its own threshold for what it considers acceptable, so 65% might be a comfortable pass at one school and below the minimum at another. There is no central moderation process that adjusts marks based on the cohort sitting the exam in a given year.
How does the ISEB pre-test in Year 6 relate to the Common Entrance examination in Year 8?
The ISEB Common Pre-Test is a computerised assessment typically taken in Year 6 (age 10–11) and used by many senior schools — including Eton — to decide whether to offer a conditional place. It tests verbal reasoning, non-verbal reasoning, English and Mathematics. If a pupil passes the pre-test and receives a conditional offer, they must then meet the school's CE mark requirements at the end of Year 8 to confirm their place. The two assessments are separate: the pre-test secures the offer, and CE confirms it.
What happens if a pupil fails to meet the CE threshold after receiving a conditional offer?
This depends on the school and the circumstances. Some schools will review the situation holistically — taking into account the pupil's school report, interview performance and the margin by which they missed the threshold — and may still offer a place. Others will withdraw the conditional offer if the required mark is not met. In borderline cases, schools sometimes invite pupils for an additional interview or ask for further information from the prep school. It is always worth the family contacting the admissions office directly rather than assuming the worst.
How do Common Entrance examinations differ from scholarship examinations at 13+?
Common Entrance is designed to confirm that a pupil meets the academic standard required for entry. Scholarship examinations — whether set by ISEB or by individual schools — are designed to identify exceptional ability and are typically harder in both content and style. Scholarship papers often require more extended analytical writing, greater depth of subject knowledge, and the ability to engage with unfamiliar material under pressure. A pupil sitting for a scholarship will usually sit both the CE papers and the scholarship papers, with the CE mark confirming entry and the scholarship result determining whether an award is made.
If you are supporting a child through the 13+ process, the following pages may be useful:
Common Entrance at 13+ is a significant milestone, but it is one that rewards consistent, well-structured preparation rather than last-minute cramming. Understanding what each subject paper tests, knowing the mark thresholds your target schools expect, and identifying whether those schools use standard CE or their own papers are the three most important steps any family can take early in the process. With the right preparation in place, most pupils are well capable of meeting — and exceeding — the marks they need. Leading Tuition works with pupils across Year 7 and Year 8 to build the subject knowledge and exam technique that CE demands. Whether your child needs support in one subject or across the board, targeted preparation makes a measurable difference.
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