UK Private School Entrance Exams: The Complete Parent’s Guide (2026)

Last updated: 29 May 2026

Quick Answer

TL;DR

If you’re applying to a UK private senior school for 11+ or 13+ entry, three things matter more than any other detail. First: know which exam your target schools actually use, because the preparation strategy for the ISEB Common Pre-Test is different from the strategy for Westminster’s own paper, and a tutor who specialises in one isn’t automatically expert in the other. Second: register early. The deadline window is much longer than parents expect, and missing it ends the application before any preparation matters. Third: the fear most parents bring to this process is whether their child is capable. In practice, the real risk is whether the preparation closes the gap between what a capable child knows and what the exam rewards. This guide covers what your child will sit, when, how it’s marked, and what good tutoring should look like at this level.

Why UK Private School Admissions Are Different in 2026

The UK private school market in 2026 is the most competitive it has been in a generation. The top fifteen senior schools collectively select around one applicant in ten. For Westminster, St Paul’s, and a handful of others, the ratio is closer to one in fifteen. These numbers aren’t soft. They reflect a real shift in the application volume reaching these schools, driven partly by international demand and partly by the broader squeeze on grammar school capacity in the maintained system.

What this means for a parent is straightforward. The margin between a child who earns a place and one who doesn’t is narrow, and the difference is almost always in the preparation. Most parents understand that. What they often don’t understand is the format: how the exams are structured, who sets them, when they happen, and how the results actually feed into the school’s decision.

A separate point worth making before anything else. The fear that takes most parents into this process is usually the wrong one. Almost every parent who books a consultation with us assumes the question is whether their child is good enough. In practice, it almost never is. The children who don’t earn places at these schools are rarely the ones who couldn’t have. They’re the ones whose preparation missed something specific. A registration deadline. An exam format. A specific section the school weighs more heavily than the others. An interview round nobody told the family was coming. That’s not the parent’s failure, and it’s certainly not the child’s. It’s the system being opaque enough that even well-organised families can miss something material.

This guide is here to make the system less opaque.

What Your Child Will Actually Sit

There are three different exam routes into UK private senior schools at 11+ or 13+ entry. Most schools use the first. A small number use the second. A few elite schools run the third alongside or instead of the others.

Route 1: The ISEB Common Pre-Test (the dominant format).

ISEB stands for the Independent Schools Examinations Board. The ISEB Common Pre-Test is the shared exam taken once and submitted to every school your child has applied to. Your child sits it once, the score goes to every school on the application list, and that’s it. The schools then use the result alongside school reports, interview rounds, and any additional bespoke tests as part of their admissions decision.

The Pre-Test is adaptive, which means the questions get harder when your child gets answers right, and easier when they don’t. It’s online, computer-based, and runs on the Century Tech platform. It covers four sections: English (with a comprehension reading), Maths, Verbal Reasoning, and Non-Verbal Reasoning. Total time is roughly two hours and fifteen minutes. We cover the format and scoring in detail in our dedicated ISEB Common Pre-Test in depth guide.

Route 2: Common Entrance at 13+.

The older route into UK private senior schools, still used by a subset of traditional schools. Common Entrance is sat at the end of Year 8. It’s been increasingly displaced by ISEB Pre-Test pre-screening in recent years, but it still exists. If you’re applying to a school that uses it, your child sits subject papers (English, Maths, Sciences, languages) and is assessed by the school against its admissions criteria.

Route 3: Bespoke school-specific exams.

Some elite schools run their own entrance exams instead of, or alongside, the ISEB. The standout example is Westminster: its 11+ entry uses a school-specific assessment held at the school in November of Year 6. Westminster’s 13+ entry is different again, using the ISEB Common Pre-Test in autumn of Year 6 followed by further Maths and English tests plus an interview round in January. Other London schools run similar bespoke processes for specific entry points, and we cover named schools in our top London independent schools guide.

The practical implication: before you commit to any preparation, find out exactly which exam each of your target schools uses. This is the single highest-leverage action a parent can take in the early stages. A tutor who’s worked on the ISEB Pre-Test format weekly for three years won’t necessarily know what Westminster’s own 11+ paper looks for. The substance overlaps, but the preparation strategy doesn’t.

The ISEB Common Pre-Test in Depth

Because most families will encounter the ISEB Pre-Test in some form, the format deserves a closer look.

The four sections.

English runs around forty minutes and includes a comprehension passage that the child reads on-screen before answering the questions. Vocabulary, sentence structure, and inference are tested directly. The comprehension demands are higher than parents tend to expect: the texts are written for fluent readers and assume an active vocabulary that extends well beyond what’s covered in the average Year 5 or Year 6 syllabus. We’ve written a separate guide on building vocabulary for the 11+ from Year 4 upwards, because this is the single biggest avoidable weakness we see.

Maths runs around forty minutes. It covers arithmetic, fractions, decimals, percentages, basic algebra, geometry, problem-solving, and data interpretation. The difficulty calibration is generous at the start and steepens quickly because of the adaptive scoring. A strong child can find themselves answering substantially harder questions partway through than the average child sees at all.

Verbal Reasoning runs around twenty-five minutes. It tests language logic: word relationships, codes, sentence patterns, logical deduction from text-based clues. The question types are recognisable but not always intuitive without practice.

Non-Verbal Reasoning runs around thirty minutes. It tests visual logic: pattern completion, shape rotation, spatial relationships, sequences. Children with strong visual processing tend to find this section the easiest, but it rewards specific question-recognition technique that most schools don’t teach.

How the scoring works.

The result is reported as a Standardised Age Score, or SAS. The average is 100, the maximum is 142. Competitive senior schools generally look for a SAS of 120 or higher. A SAS below 82 is considered “low” by the test itself. The scoring is normalised by age so that a younger child and an older child within the same year group are compared on a level basis.

Parents don’t see their child’s results. The score is reported directly to every school on the child’s application list. This is deliberate: it prevents parents from selectively forwarding results to schools, and it lets schools see exactly the same data on every applicant.

The implication for preparation is that you can’t course-correct on observed results. You don’t get a mock-paper-then-real-paper improvement cycle the way you might for GCSE or A-Level. The first time the result matters is also the only time it’s recorded. Mock practice has to be calibrated against the real exam’s difficulty curve, which is one of the things experienced ISEB tutors do well and inexperienced ones often miss.

When the Pre-Test happens.

Live testing for the 2026–27 admissions session opens on 1 September 2026. Most children sit the test some time in the autumn term of Year 6 (for 11+ and 13+ entry), and the final deadline for that session is typically late spring of the following year. Most schools want results in by mid-autumn, however, so the practical window for sitting the test is September to November of the year before entry.

Your child’s prep school will normally coordinate the booking. If your child is at a state primary or a school that doesn’t routinely run ISEB candidates, you may need to arrange the booking yourself through a participating prep school or assessment centre. If that’s your situation, raise it well in advance: arranging an external sitting takes time.

School-Specific Exams: What You Need to Know

Each of the most competitive UK senior schools runs its own admissions process layered on top of the ISEB result. A short tour of the most-asked-about schools follows.

Westminster School (11+ entry). A school-specific exam held at Westminster in November of Year 6. The format is separate from the ISEB Pre-Test entirely. The preparation strategy is different, and a tutor with deep Westminster 11+ experience is a different specialist from a tutor with deep ISEB experience.

Westminster School (13+ entry). Uses the ISEB Common Pre-Test in the autumn of Year 6 as a pre-screen. Shortlisted candidates return in January for further Maths and English tests, plus an interview round.

St Paul’s School. Uses the ISEB Common Pre-Test at 13+ entry, with a school-specific written assessment and interview round for shortlisted candidates. Highly competitive: the selection ratio is among the steepest in the country.

Eton College. Eton’s main entry point is 13+ (Year 9). It uses the ISEB Common Pre-Test as a pre-screen and follows up with the Eton College King’s Scholarship exam for the King’s Scholar route, or Eton-specific interview and assessment rounds for the Oppidan route.

Harrow School. ISEB Common Pre-Test at 13+ pre-screen, followed by Harrow’s own assessments and interview rounds for shortlisted candidates.

Winchester College. Uses the ISEB Common Pre-Test for 13+ entry, with a school-specific assessment and interview process for shortlisted candidates.

City of London School and Highgate. Both use the ISEB Common Pre-Test, with school-specific written components and interviews.

The pattern across all of these is the same shape with different details. ISEB sits as the broad pre-screen filter. The school-specific second-round assessments are where the real selection happens. If you’ve prepared your child for the ISEB but not for the interview round, or for the school-specific writing assessment, or for the Maths and English tests that follow, you’ve stopped halfway. That’s a specific failure mode worth naming because it’s common.

The Timeline Parents Get Wrong

The biggest avoidable failure point in this entire process is the registration window.

Senior school registration deadlines fall 12 to 18 months before the child’s intended start date. So if your child is starting in September 2027, you’re looking at a registration deadline somewhere between March 2026 and September 2026, depending on the school. Some schools open registration much earlier than that and close it earlier too. Westminster, for example, has firm October deadlines for 11+ entry: miss the date and the application is closed for that year, regardless of how well-prepared your child might be.

A condensed timeline of what parents should be doing and when (we cover this in much more detail in our year-by-year preparation timeline piece):

Year 4. Have a long conversation with your child’s class teacher about whether senior school entrance preparation is appropriate. Begin a reading-for-pleasure habit at challenging vocabulary level. Don’t start exam-specific preparation yet. Build the foundations first.

Early Year 5. Identify target schools. Read each school’s admissions page in detail. Note registration windows and the exams used. Begin structured tutoring if the gap between current ability and required ability needs closing.

Late Year 5. Confirm registrations for all target schools. Increase tutoring frequency if necessary. Begin specific format work for whichever exams your target schools use.

Autumn Year 6. ISEB Common Pre-Test sittings happen. Westminster 11+ assessment happens in November. The window of preparation closes, and the exam window opens.

January and February of Year 6. Second-round school-specific assessments at the schools that run them. Interview rounds. Offer letters typically follow in the spring term.

If your child is already in Year 6 and you’re only now starting to think about this, contact a specialist agency this week. Time is short but not impossible. The honest assessment you’ll get from an experienced consultant matters more than any specific tutor at this point.

What an Expert Tutor Actually Does at This Level

There’s a useful distinction between content tutoring and exam tutoring, and it matters more at this level than at any other.

A content tutor knows the material. They can explain how to solve a percentage problem, parse a sentence, or rotate a shape. That’s a starting point, not a finish line. For UK senior school entrance, what your child actually needs is somebody who knows how this specific exam tests these specific skills, where children consistently lose marks, what the school is looking for in the written sections, and how to manage the time and the format of the actual paper.

At Tailored Tutors, we focus specifically on the exam side of that distinction. The tutors we place for 11+ and 13+ preparation are exam professionals. DBS-checked. Heads of Department and current or former examiners. Educators with verifiable track records of preparing children for the specific schools you’re targeting. Tailored Tutors operates a strict top 20% acceptance policy. Founder Rich Thompson personally interviews and assesses every tutor before they go on the roster, and the majority of applicants are not accepted.

What that looks like in practice during a tutoring engagement for senior school entrance:

The first session is diagnostic. Your child works through a calibrated assessment that exposes which sections they’re strong in, which they’re weak in, and where the specific question types are losing them marks. This isn’t about giving you a discouraging picture. It’s about knowing where to spend the next twelve months efficiently. Volume of practice without diagnosis is one of the most common ways families spend a great deal of money and recover surprisingly little ground.

Subsequent sessions work the specific weak areas. Vocabulary depth for ISEB English comprehension. Adaptive-format timed exam strategy so your child handles the harder questions in the second half without panicking. Specific question-recognition patterns in Verbal Reasoning. Mock conditions under time pressure. Debrief after every mock so the next week’s session targets what actually went wrong.

In the final months, the work shifts toward composure. The technical preparation is done. What matters now is that your child walks into the exam room calm, knows the format, knows the timing, and has a strategy for the moments where they’re not sure.

A good tutor at this level isn’t a luxury. They’re a specific kind of competence the school system rarely provides, even at the best fee-paying schools, because senior school entrance is a separate domain from the standard curriculum, and very few classroom teachers have direct experience of it from the exam side.

“Most of the children we work with for senior school entrance are entirely capable of the result. What they need is the right preparation, properly targeted, with somebody who knows exactly what each school is testing for. Get the preparation right, and the rest follows.”
Rich Thompson, Founder, Tailored Tutors

For a broader view of what to look for in a tutor at this level, see our companion 11+ tutor guide.

Common Mistakes That Cost Children Places

After years of placing tutors for senior school entrance, the same patterns recur in how capable children miss out.

Missing the registration window. The single most expensive avoidable error in this process. Schools close registration months before parents expect. Once it’s closed, no amount of preparation reopens it.

Preparing for the wrong exam. Families spend a year on intensive GL Assessment style preparation for a school that actually uses the ISEB Pre-Test, or the other way round. The format work doesn’t transfer cleanly between exams. Establish which exam each target school actually uses before the first session.

Underestimating ISEB English comprehension demands. The reading passages on the ISEB Common Pre-Test routinely use vocabulary and sentence structure that’s a year or two ahead of what most Year 6 children encounter day-to-day. Children who are confident readers in their school context can still be exposed by the ISEB texts. Vocabulary depth needs deliberate building from Year 4 onwards.

Treating the interview round as an afterthought. Schools that interview shortlisted candidates take it seriously. A bright child who’s never practised structured interview conversation can underperform relative to what they actually know, and the interview can be the deciding factor when applicant numbers are close to the bar.

Doing mock papers without proper debrief. Twenty mocks done in front of a parent who marks them but doesn’t analyse them are worth less than ten mocks done with a tutor who walks through each mistake, identifies the pattern, and adjusts the next week’s work accordingly.

Hiring a tutor who isn’t specialist for this exam. A patient generalist tutor can produce surprising results in some contexts. UK senior school entrance is not one of those contexts. The exam-specific knowledge is the value, and the wrong tutor at this level costs the family money and time they don’t have to spare.

Frequently Asked Questions

What’s the difference between the 11+ and the ISEB Common Pre-Test?

The 11+ is a broad term referring to selective entry exams sat by children in Year 6, primarily for grammar school entry (state-funded) or private senior school entry. The ISEB Common Pre-Test is the specific exam used by most UK private senior schools at 11+ and 13+ entry. So the ISEB Pre-Test is one type of 11+ exam. Other 11+ exams include GL Assessment (used by most grammar schools), Cambridge Select Insight (CEM’s online format, used by a small number of schools), and bespoke school-specific papers such as Westminster’s.

What SAS score does my child need?

It depends on the school. Competitive senior schools typically want a SAS of 120 or higher. The most selective (Westminster, St Paul’s, Eton) tend to start their conversations with shortlisted candidates above 130. A SAS in the 100 to 119 range is solid, but unlikely to win an offer at the most competitive schools on the strength of the Pre-Test alone.

Do parents see ISEB results?

No. Results go directly from ISEB to every school on the child’s application list. Parents don’t receive the score. This is intentional, and applies to every family, not just yours.

Is the ISEB Pre-Test harder than the 11+ for grammar school entry?

Not necessarily harder. Different. The ISEB Pre-Test’s English comprehension demands are higher than most grammar school 11+ papers. The Maths content is similar. The adaptive format changes the strategy. Vocabulary depth and time pressure tend to be where ISEB candidates lose marks compared to grammar school candidates.

What about Common Entrance at 13+?

Common Entrance is still used by some traditional independent schools for 13+ entry. The exam is sat at the end of Year 8. If your target school uses Common Entrance, the preparation is more curriculum-focused than for the ISEB Pre-Test. Many schools that historically used Common Entrance now use the ISEB Pre-Test as a pre-screen, with Common Entrance retained as a subject assessment alongside it.

How much does a private school entrance tutor cost?

At Tailored Tutors, expert one-to-one sessions start from £60 to £90 per hour, depending on the tutor’s specialism and experience level. That’s the cost of a verified specialist with direct exam-board experience and a track record of senior school placements. Tutors charging significantly less than that are unlikely to have the relevant specialist credentials at this level. On a one-shot, one-place exam, the cost of the wrong tutor is the school place itself.

Is there a free trial before I commit?

Yes. Every placement begins with a free 30-minute consultation call with an experienced educator, not a sales representative. After that, there’s a free, no-obligation 30-minute first session with the matched tutor before any payment is required. No upfront commitment. No long-term lock-in. Individual sessions can be cancelled with 24 hours’ notice.

My child’s school doesn’t prepare for this. Is that normal?

Yes. Even excellent prep schools and academically strong state primaries focus on curriculum delivery, not on senior school entrance exam preparation. The two are different domains. Most families who place children in competitive UK senior schools supplement their child’s classroom education with specialist tutoring for the entrance exam, regardless of how strong the school’s general teaching is.

Can my child sit the ISEB Pre-Test if we’re outside the UK?

Yes. The ISEB Pre-Test is sat at participating prep schools and accredited assessment centres internationally. We work with a number of international families whose children are applying to UK senior schools from overseas, including from the Middle East. The logistics need to be arranged well in advance, and your child’s current school can usually facilitate the booking.

Bottom Line

Ready to start? Book a free consultation call with Tailored Tutors. You’ll speak to an experienced educator (not a sales representative), get an honest assessment of where your child stands, and leave with a clear plan for the next twelve months.