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What the ISEB Common Pre-Test is
The Independent Schools Examinations Board (ISEB) developed the Common Pre-Test in the early 2000s to give independent senior schools a single objective measure of candidate ability that could be sat once and used by multiple schools. Before its introduction, candidates routinely sat three or four separate entrance tests across the autumn term of Year 6. The Pre-Test cut the testing load and introduced an age-standardised score that schools can compare across cohorts and intakes.
The test is computer-adaptive: the difficulty of each question adjusts to the candidate's performance on the previous one. The total testing time is just under two and a half hours, split across four sections: English, mathematics, non-verbal reasoning and verbal reasoning. The candidate sits the test on a school computer in a supervised environment, usually at their current preparatory school or, for international candidates, at a registered ISEB test centre. The score is delivered to participating senior schools electronically, usually within two to three weeks.
The test is taken once. The candidate may sit it from June of Year 5 through to December of Year 6 (or, for some 13+ schools, into Year 7), but only once. The score is then used by all the senior schools that have registered to receive it. For an internationally mobile family this is a useful efficiency: one test, multiple applications.
The four sections in detail
| Section | Duration | Content focus |
|---|---|---|
| English | 25 minutes | Reading comprehension, vocabulary, spelling and basic grammar |
| Mathematics | 50 minutes | Number, algebra, geometry, data handling at upper Key Stage 2 level |
| Non-verbal reasoning | 32 minutes | Pattern recognition, spatial reasoning, sequences |
| Verbal reasoning | 36 minutes | Word relationships, analogies, logical word problems |
The English and mathematics sections test what the candidate has been taught at preparatory school. The two reasoning sections test cognitive aptitude rather than taught content; preparation can familiarise the candidate with question types but cannot teach the underlying ability. Schools weight the four sections differently depending on what they are looking for. The most academically selective schools weight verbal and non-verbal reasoning heavily; less selective schools weight English and mathematics more, valuing taught attainment.
Where candidates lose marks
The most common reasons for underperformance are pacing (running out of time on the longer sections), unfamiliarity with the digital interface (the test cannot be flagged for review and answered later, so guessing within time is part of the strategy), and fatigue (the test is taken in a single sitting and the last two sections can suffer if the candidate has tired). Each of these can be mitigated with realistic practice in conditions that mirror the actual test environment.
When to sit the test and registration
The standard sitting window runs from October to early December of Year 6 for 11+ and 13+ entry. The candidate's current preparatory school usually administers the test directly; if not, ISEB maintains a list of registered test centres. Registration is normally handled by the prep school, which collects the candidate's details and the list of senior schools that should receive the result. For overseas candidates, registration can be made directly with ISEB online, with the test taken at the nearest international centre.
The registration window typically opens in May or June of Year 5 and closes about six weeks before each test month. Families targeting heavily oversubscribed senior schools should aim for an October or early November sitting; this avoids the December sittings, which are heavily booked at international centres and which leave little margin if the test result needs to support a January application deadline. The companion piece on UK boarding application timelines covers the wider admissions calendar.
How schools really use the score
The ISEB result is reported as an age-standardised score across each section and as an overall mean. Most senior schools do not publish a public cut-off; in practice, candidates scoring above 110 (the top 25 per cent) are competitive for selective boarding schools, and above 120 (the top 10 per cent) for the most selective. The result is one input among several, however, and a strong school reference, a confident interview and a parent statement that fits the school's character can compensate for a borderline test score.
Boarding schools place particular weight on the school reference, which describes the candidate's character, work ethic, social maturity and likely contribution to the boarding community. The reference matters as much as the test score for most schools. The interview, which usually follows the test by several weeks, gives the school its own read on the candidate. The Pre-Test result is a filter; the reference and interview are the decision.
Talk to us before you fix the shortlist
The realistic senior school shortlist depends on the candidate's profile, the family's geography and the boarding budget. Our editorial desk takes confidential enquiries; there is no commercial relationship with any school. Pair this with the school finder for a faster first pass, and the compare tool for side-by-side school comparison.
A realistic preparation plan
Preparation should start six to nine months before the chosen test date, not earlier and not later. Earlier preparation has diminishing returns; the cognitive abilities the reasoning sections test mature on a developmental clock that cannot be rushed. Later preparation leaves no time for the candidate to internalise the question types and the digital format.
A workable plan looks like the following. Months six to four before the test: introduce the candidate to the four section types, work through one practice paper per fortnight, focus on familiarity not speed. Months four to two: increase the cadence to one practice paper per week, work specifically on pacing and on weakness areas, mix in a small number of full-length timed practice tests. Months two to zero: weekly timed full-length practice tests in the same time of day as the real test, with the candidate sitting them on a computer rather than on paper.
The case against heavy tutoring
The temptation to tutor the candidate heavily through Year 5 and Year 6 is understandable but often counter-productive. Heavily tutored candidates can present an inflated test score that is then poorly matched to the actual academic level the senior school expects. The school's reference, the interview and the subsequent settling at the senior school all surface the mismatch quickly. Aim for preparation that is sufficient to give a true read of the candidate's ability, not one that distorts it.
One or two hours a week of focused, parent-supervised work is generally sufficient for a well-prepared Year 5 candidate from a strong preparatory school. Two to three hours a week is reasonable for a candidate from a less academically intensive primary school. Beyond that, returns diminish and the candidate's broader life suffers. The school the candidate sits at on the day of the test, and the candidate's school report from Year 5 and the autumn of Year 6, will tell the senior school more than another ten hours of tutoring will.
Sitting the test from overseas
For internationally mobile families, the test can be sat at any ISEB-registered international test centre. The largest are in Hong Kong, Singapore, Dubai, Bangkok, Geneva, Mumbai and Sydney. Registration is via ISEB's international portal. Bookings open earliest at the smaller centres and the autumn slots close first; aim to register by the end of July at the latest.
The international centres are usually quieter than the UK preparatory school environment. This works in the candidate's favour. The downside is the unfamiliarity: most international candidates have not sat the test in the same room as their classmates and do not have the pre-test conversations and reassurance that a UK prep school environment provides. A pre-test visit to the test centre, if practical, helps the candidate settle. Our pieces on UK boarding for international families and UK boarding from Asia cover the wider international admissions context.
What happens after the test
The score is released to the senior schools the candidate has nominated, usually within two to three weeks. Schools then make interview invitations on the basis of the score, the reference and the parent statement. Interviews run from January to March of Year 6 for 11+ entry. Offers are made in February or March. Families confirm acceptance by the early-March reply date.
If the test score is weaker than hoped, the candidate is not out. Many senior schools interview candidates below their usual cut-off if the school reference is strong or if the school has an existing relationship with the prep school. A second senior school application cycle in Year 7 or Year 8, with the candidate sitting a school-specific 13+ test, is also a viable route at many leading schools. The single test result does not close all doors.
ISEB preparation checklist
- Senior school shortlist confirmed by end of Year 5
- Registration completed via prep school or ISEB international portal
- Preparation started six to nine months out
- One practice paper per fortnight, then per week, then full-length timed
- Digital interface familiar (mouse, no flagging, single sitting)
- Pre-test centre visit where geographically possible
- Strong school reference confirmed with current prep school
- Interview preparation booked for January to March of Year 6
FAQ
The ISEB Common Pre-Test is a computer-adaptive test taken by candidates aged 10 to 11 (Year 6) as the first stage of admission to many leading UK senior and boarding schools. It covers English, mathematics, non-verbal reasoning and verbal reasoning. Schools use the result alongside school reports, references and interviews to shortlist for Year 7 or Year 9 entry.
Most candidates sit the test in the autumn term of Year 6 (October to December). Some schools accept the test from June of Year 5 onwards. The candidate can sit the test only once per academic year, so the timing matters and should align with the application deadlines of the target schools.
Most boarding schools use the ISEB result as one input alongside school references, interviews and sometimes a school-specific test. Few schools publish a cut-off score; in practice, scores in the top 25 per cent are competitive for selective boarding schools, the top 10 per cent for the most selective.
No. The candidate may sit the Common Pre-Test only once per academic year. A second attempt in a later academic year (for 13+ entry) is possible but rare; most schools accept the original result.