ISEB Common Pre-Test Preparation for the 2026-27 Session

The ISEB Common Pre-Test is four multiple-choice, adaptive, online assessments taking 2 hours 15 minutes in total. Live testing for the 2026-27 session began on 1 September 2026 and ends in late May 2027. A child sits it once in an academic year, and the result is shared with every senior school given their Applicant ID.

The four assessments are English, mathematics, verbal reasoning and non-verbal reasoning. Two features of how ISEB has built the test decide how a child should prepare for it, and neither is obvious from the name: the questions adapt to the answers already given, and the results are standardised across the whole testing period as well as by age.

When Does the 2026-27 Testing Session Run?

Three dates govern the session, and only one of them is the test. The registration date comes first, in the summer term before the year of testing, and ISEB asks families not to register before it.

A Year 6 child sitting in this session is testing for September 2027 entry at 11-plus. Where the school defers to Year 9, the entry is September 2029 for a child who sits in Year 6 and September 2028 for one who sits in Year 7, because ISEB designs the tests for pupils in Years 6 and 7. ISEB describes the window in terms and in dates. In terms, the tests can be taken at any point between the autumn and spring term of one academic year as determined by the senior school; in dates, ISEB gives 1 September 2026 to late May 2027. Either way, the date within the window is arranged by the senior school and the invigilation centre, so the senior school's deadline, not ISEB's end date, is the one to plan against.

Working Back from a January Sitting

ISEB's published dates for 2026-27 are the three in the table above. The sitting date inside that window is not ISEB's: a senior school sets the deadline and an invigilation centre schedules the tests against it, using the earliest deadline where a child has applied to more than one school. A January sitting is therefore the date to count back from only if the earliest deadline among your schools falls in January.

Two things have to happen before a centre can schedule a sitting. The parent registers, and ISEB's senior-school page says parents can do so between 9 June 2026 and early May 2027. A senior school then uploads the Applicant ID, and ISEB states that an invigilation centre cannot schedule a test until at least one senior school has done so. The booking is a further step: if you chose a centre in the Guardian Portal, ISEB tells parents to contact it and make sure the tests are booked to take place before the deadline. Our reading: the sooner the Applicant ID reaches each school, the more room the centre has to schedule around it.

ISEB says the Pre-Tests are based on the national curriculum, that a child is prepared through schooling, and that additional preparation is not a requirement; the mathematics test goes only up to the end of Year 5. ISEB's own guide suggests giving more time to the sections a child finds challenging, which their teachers can identify. Our reading: the weeks before a January sitting are best spent on those sections and on the parts of the test that are not school work, which are the adaptive screen and the reasoning questions ISEB says may be unfamiliar, rather than on re-teaching the curriculum. ISEB designs the tests for pupils in Years 6 and 7, so the child sitting in January may be in either year.

ISEB's advice for the family has three timing points: sit down a few months before the exam to agree plans for each outcome; avoid last-minute revision sessions the night before; and do not ask the child to revise on the morning of the test. If your child is in Year 8 rather than Year 6 or 7, our guide to the Year 8 ISEB Pre-Test and 13+ preparation covers that year.

What Adaptive Testing Does to the Paper Your Child Sees

ISEB's own description is that children are presented with questions based on their previous answers, so they do not spend time on questions that are too hard or too easy, and the test can be shorter while still giving an accurate score.

ISEB adds that pupils who answer questions correctly are gradually tracked to harder questions, while those who consistently answer incorrectly are tracked to easier content. Our reading of what that means for practice: a printed practice paper at a fixed level cannot reproduce the experience, because in the real test the difficulty moves with performance.

ISEB is careful about what harder questions do and do not mean. It says scores are not calculated from the number of questions answered or from reaching ‘harder’ questions, that high scores can be achieved even with some incorrect answers, and that all candidates will be able to see ‘harder’ questions. Its algorithm looks for consistency over time, so a mistake made early through nerves is gradually overwritten. Our reading: a child who has only practised at one level may take a harder question as a sign of failure, so practice that varies in difficulty makes the change familiar, and the instruction worth giving a child is to answer each question as accurately as they can, not to race.

Does Sitting Later in the Window Help?

ISEB's Test Framework says it does not matter what age a pupil is or what time in the academic year they sit the tests: the score is adjusted for age and placed on a scale that makes a comparison with a standardisation sample taken from the independent schools' sector.

Results are age-standardised against a sample of pupils applying for independent school admission across the academic year, and ISEB states the purpose directly: to ensure there is no disadvantage for younger children, or those who take the tests earlier in the testing period. Our reading of that, rather than a claim ISEB makes: if testing early carries no disadvantage, testing late carries no advantage in the score. What a later date does give is more preparation time.

Our reading: where the senior school leaves the date open, it is better chosen on the child's readiness and workload than on the calendar.

What the Pre-Test Is Not, and What Comes After It

The Pre-Tests are a screen, not the whole assessment. ISEB says they are designed for senior schools to use as one part of their admissions process, and its offline-preparation article points to the senior school interview, which is designed to help the school get to know a child personally. For a 13-plus applicant the gap is longer still. ISEB designs the tests for pupils in Years 6 and 7, so the result sits with the school for two more years of prep school after a Year 6 sitting, or one after a Year 7 sitting, before the place is taken up; ISEB describes the Pre-Tests at schools such as Eton and Harrow as a precursor to Year 9 entry.

That gap is the defining feature of the 13-plus route. Our reading: for a child who sits in Year 6 it leaves two years of prep school ahead (one, after a Year 7 sitting) before the place is taken up, so the Pre-Test is the start of the route and not the end of it.

Our reading: the Pre-Test deserves proportionate effort rather than total effort. ISEB describes it as one part of a larger admissions process, taken once in an academic year on a date the senior school sets, and scored against a sample of pupils applying to independent schools. ISEB's own advice is to approach any additional test practice or preparation in a holistic and healthy way.

Who Holds What: the Three Portals

The Pre-Tests are administered through three separate portals, each with its own job.

The registration itself is the family's job, not the school's. The invigilation centre is a separate question. ISEB says most children in the UK take the Pre-Tests at their current prep or junior school, and that a current school which does not usually host them can set up as a centre; if that is not an option, many senior schools act as centres. A child who can sit at neither needs a non-school venue, which ISEB says the family has to arrange, with ISEB able to help. Our reading: settle both in the summer term rather than in September.

What Is Actually Assessed, and in What Shape

Four assessments, all multiple choice, all online: English, covering reading comprehension and grammar; mathematics; verbal reasoning; and non-verbal reasoning. Together they take 2 hours 15 minutes. ISEB sets a standard length for each test, given in the next section, and the adaptive design can shorten the test for an individual child.

They need not be sat in one block. ISEB allows the four to be taken together on the same day or split across multiple days, and the invigilation centre arranges it. For a child who tires or who has access arrangements, splitting is worth asking about rather than assuming a single long morning is the only option.

Non-verbal reasoning is one of the two reasoning tests ISEB describes as using question types that may be unfamiliar. Our reading: that is a reason to give it practice time of its own.

One more feature is worth setting up in advance. The online test player includes customisable accessibility options for every candidate, including colour overlays and font choices. A child who has practised with the settings they prefer starts the test in a familiar interface; a child meeting those options for the first time on the day is being asked to make a decision under pressure.

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What Is on Each of the Four Tests

ISEB divides what it measures in two. The English and mathematics tests assess attainment: topics and knowledge pupils are taught in class, recalled and applied to problems. The verbal and non-verbal reasoning tests assess potential, through question types that may be unfamiliar to a child. The table gives the standard length ISEB sets for each test and the content ISEB's Test Framework lists for it.

How the screen behaves matters as much as the syllabus. ISEB says each question must be answered and that applicants cannot go back to previous questions. Because the test is adaptive, a child may be shown a different number of questions from another child, and a test ends automatically once all its questions have been answered. Textbooks, calculators and mobile devices are not accessible during the tests, and the invigilation centre provides pen or pencil and paper for rough work. The timer is visible to every candidate and can be hidden if the countdown makes a child anxious. Where a senior school agrees, a child with SEND can have 25% extra time on each test element, and senior schools must approve any access arrangements before the tests are taken.

Our reading: the syllabus is the part a child's school already covers, which is what ISEB says too. The parts that need rehearsal are the ones no school timetable provides, which are answering without any chance to go back and meeting reasoning questions that may be unfamiliar. If your child is also being considered by a school that uses a different assessment, our comparison of Quest Assessment and ISEB sets out where the two differ.

What Senior Schools Receive, and What Families Do Not

Only the senior school sees the result. ISEB states that invigilation centres, parents, guardians and agents cannot view test results, and that it does not release the results to parents, so a parent who wants to know how a child did has to ask the school. What the school receives is a Standardised Age Score, adjusted for age and placed on a scale where the average is 100, together with individual stanine, percentile rank and group rank scores and the mean SAS. ISEB says the percentile rank and stanine are based on the SAS and differ only in the numeric ranges they use.

ISEB's support portal describes the shape of the scale: an average of 100 and a standard deviation of 15, with around 67% of pupils scoring between 85 and 115, 16% scoring over 115 and under 5% scoring more than 130. There is no pass mark. ISEB says the Pre-Tests have no grades or pass mark, because all of that depends on the school using them, and it recommends asking the school whether it can give some context to a child's result. Its own advice for handling the uncertainty is to agree Plans A, B and C a few months before the exam, including a plan for the case where the child does not pass and the family moves to a second-choice school.

Our reading: because the score never reaches the family from ISEB, the useful questions are the ones only each school can answer, which are how it uses the result and at what stage of its process. The same score can lead to different outcomes at different schools, since ISEB leaves that decision to them.

What ISEB Itself Provides for Practice

ISEB provides several things for families. Free: the Pre-Tests Walkthrough, which lets a child try the test player as it will be on the day and see the styles of question; non-verbal reasoning postcards; and a guide for parents with ideas for practice at home. For sale: the Pre-Tests (11+) Prep Pack, which ISEB describes as more than 65 premium resources with authentic practice materials and expert guidance, including, according to its offline-preparation article, 16 sets of past Common Entrance 11+ English and maths papers. ISEB also endorses one practice platform, Bond Online Premium Plus, which has a 7-day free trial and which ISEB says is the only one with verified questions and mock tests provided by ISEB.

ISEB adds that, in every other case, it has not worked with the companies offering practice, has supplied them with no questions or information about its test player, and cannot guarantee their accuracy. Our reading: that is a fair set of questions to put to any provider, tutors included. Ask what the practice questions are built from.

Reviewed October 2026: the test format, timings, session dates, registration sequence, portal responsibilities and standardisation rules on this page were checked against ISEB's own Common Pre-Tests, information-for-families, Test Framework and preparation pages, and its Pre-Tests support portal, on 17 October 2026. ISEB publishes new session dates each year, so confirm them and your senior schools' own deadlines before you plan around them.

Sitting the Pre-Test from outside the UK? Our guide to the ISEB Pre-Test from abroad sets out where ISEB lets a child sit it and what each senior school asks next.

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