The ISEB Common Pre-Test measures a child's reasoning ability alongside core maths and English skills, through four online, computer-adaptive components: mathematics, English (scored as two separate parts, comprehension and grammar/SPaG), verbal reasoning, and non-verbal reasoning. It typically takes around two hours fifteen minutes in total, sat across one or more sittings.
The four components, and what each is trying to find out
ISEB, the Independent Schools Examinations Board, designs the Common Pre-Test to give senior independent schools an early, standardised read on a candidate well before Common Entrance at 13 (CE13) exists as a paper to mark. Rather than testing what a child has been taught in a specific term or by a specific prep school, it is built to separate two things: how a child reasons, and where their core academic skills sit.
| Component | What it is actually assessing |
|---|---|
| Mathematics | Numerical reasoning and problem-solving using number, shape and data — not a specific school's scheme of work |
| English — comprehension | Understanding and interpreting a written passage |
| English — grammar (SPaG) | Spelling, punctuation and grammar, scored as its own separate result |
| Verbal reasoning | Reasoning with words and language, including codes, analogies and word relationships |
| Non-verbal reasoning | Reasoning with shapes, patterns and sequences, independent of a child's reading level |
Two things are easy to miss here. First, English produces two separate scores, not one — comprehension and grammar are reported individually, so a school sees a fuller picture than a single "English mark" would give. Second, because verbal and non-verbal reasoning sit alongside maths and English rather than replacing them, a senior school gets both a reasoning profile and a snapshot of core academic skill from the same sitting.
How long the Pre-Test takes
The four components add up to roughly two hours and fifteen minutes in total. Crucially, this does not have to be sat in one go: ISEB allows the assessments to be taken together on the same day or split across multiple days, which schools use to keep sessions manageable for Year 6 and Year 7 pupils rather than asking for one long sitting.
It's adaptive — and that changes what "the same test" means
The Common Pre-Test is described by ISEB as an online, adaptive assessment. In practice, this means the difficulty of the questions a child sees adjusts in real time based on how they are answering, so no two children sit an identical paper even when they test on the same day. This is a genuinely different mechanism from a fixed paper-based exam, and it is covered in full in a companion article: how adaptive testing works for the 11-plus.
When the 2026-27 cycle runs
Dates move slightly year to year, but the current cycle is confirmed as follows — always double-check against your chosen senior school's own timetable before relying on these:
| Milestone | 2026-27 cycle date |
|---|---|
| Guardian Portal registration opens | 9 June 2026 |
| Live testing begins | 1 September 2026 |
How the Pre-Test relates to CAT4
It's worth one clear line of disambiguation, because the two are often confused. CAT4 (the Cognitive Abilities Test, Fourth Edition) is a similar-in-spirit reasoning assessment, but it is used internally by a school that a child already attends, mainly for setting and target-tracking — not for admissions. The ISEB Common Pre-Test measures reasoning in a comparable way, but its purpose is external and selective: to give a senior school a standardised basis for an early, conditional offer to a child who does not yet attend that school. For the full picture on CAT4 itself, see What Is a CAT4 Test?.
What the score is used for
The Pre-Test result is standardised against a national sample of children applying for independent school admission, and results are available to the guardian immediately after each component is completed. Senior schools access a candidate's results through their own portal once the family shares the Applicant ID. What a school then does with that score — most often, offering a place conditionally, years ahead of Common Entrance — is covered in detail in how schools use ISEB Pre-Test scores for conditional offers.
FAQ
Is the ISEB Common Pre-Test the same as Common Entrance?
No. The Pre-Test is typically sat in Year 6 or Year 7 and is used to make an early, conditional offer. Common Entrance (CE13) is sat later, in Year 8, and largely confirms that offer rather than re-selecting the candidate from scratch.
Can my child revise for the Pre-Test the way they would for a spelling test?
Not really, for the verbal and non-verbal reasoning components — these measure reasoning style rather than taught content, so cramming facts has limited effect. The maths and English components do reward genuine underlying skill, so ordinary KS2 progress in those subjects is the most useful preparation, alongside familiarity with the question formats so a child isn't thrown by the format on the day.
Does a low score on one component rule my child out?
Not automatically. Schools see a profile across all four (five, counting English's two parts) components rather than a single combined figure, and different senior schools weight the components differently depending on what they value. A school may still make a conditional offer where one score is weaker but the overall picture, references and interview are strong.
How many times can a child sit the Common Pre-Test?
Guardians register through the Guardian Portal and testing runs from the September date onward within the cycle; a school's own admissions policy — not ISEB centrally — determines whether and when a resit is considered for a particular applicant, so this is a question to put to the senior school directly.
If your child is preparing for the ISEB Common Pre-Test, focused support in the underlying maths and English skills it measures can help — explore aitutors.me to find out more.