Harrow School 11+ Admissions Guide 2026

Harrow School is a boys' boarding school in Harrow on the Hill, north-west London, and admits around 160 boys each year into Year 9, in the September following their 13th birthday. Entry to Harrow School is a two-stage process beginning in Year 6: Stage 1 is the ISEB Common Pre-Test, taken at the candidate's own school in the autumn term (before 30 November 2026 for boys now in Year 6); Stage 2 is the Harrow Test, held at Harrow School itself in the spring term (January to March 2027 for those boys), consisting of a computerised English and Maths assessment, a group activity, and an interview with a Housemaster. Families in Harrow borough may also consider John Lyon School, a co-educational independent school in the same John Lyon's Foundation as Harrow School, which runs its own entrance examination. This guide covers both stages of the Harrow School admissions process in full, what Harrow is looking for at each stage, how to prepare effectively, and how Leading Tuition supports families through the process.

About Harrow School — One of England's Most Prestigious Boarding Schools

Harrow School's estate covers 324 acres at Harrow on the Hill, 12 minutes by train from Marylebone. It is a full-boarding school for boys aged 13 to 18, organised into 12 boarding Houses. Harrow was founded in 1572 under a royal charter from Queen Elizabeth I, by the local landowning farmer John Lyon.

The school looks for boys who will flourish intellectually, contribute meaningfully to school life beyond the classroom, and thrive in an all-boarding environment. The admissions criteria explicitly list: a boy who will thrive in a boarding environment and make the most of the opportunities offered; who will make a positive contribution to school life inside and outside the classroom; who is talented academically or in sport, the arts, or other areas; and who has a good behavioural record and the potential to show leadership.

Around 160 boys are admitted into Year 9 each year. The standard registration deadline is 30 September of Year 6 (for boys now in Year 6 it was 30 September 2026), with a non-refundable registration fee of £450, inclusive of VAT. Families who register after 30 September of Year 6 are considered Late Applicants and compete for fewer places; Harrow's FAQs say a Late Applicant is only invited to sit the Harrow Test with a very strong reference and an equally strong performance in the ISEB Common Pre-Test. For boys now in Year 6, Harrow's key dates give 1 January 2028 as the late-applicant registration deadline. Harrow recommends that families visit the school when boys are in Years 4 or 5, at one of its Open Mornings.

Selective Schools in the Harrow Area — John Lyon and Beyond

Beyond Harrow School itself, this guide covers John Lyon School, a co-educational independent day school in north-west London. John Lyon is part of John Lyon's Foundation, and its 11+ selection is based on its entrance examinations, school reports, school reference, group discussion and group activity. For September 2027 entry, John Lyon's deadline for 11+ applications is 4pm on 31 October 2026, and registered Year 6 applicants sit the entrance examination on Wednesday 18 or Thursday 19 November 2026. Harrow Council's closing date for secondary school applications for September 2027 is also 31 October 2026, and national secondary offer day is 1 March 2027.

ISEB describes its Pre-Tests as a shared assessment, so a child's results can be accessed by all of the senior schools that require them. Harrow's own rule is that applicants can sit the Common Pre-Test only once in any one academic year and only once after registering for Harrow School.

Stage 1 — The ISEB Common Pre-Test: What Your Child Will Face

The ISEB Common Pre-Test is a computer-based, adaptive assessment that all Harrow School applicants are required to sit — for standard applicants in the autumn term of Year 6, between 1 October and the end of November (before 30 November 2026 for boys now in Year 6), and for Late Applicants as soon as possible after registration. Boys who have already sat the ISEB Common Pre-Test for another school should tell Harrow's Admissions Office, which can access his results with his ISEB Applicant ID. ISEB gives the four tests as taking 2 hours 15 minutes to complete (Harrow's admissions page says approximately two and a half hours), and they may be completed together or at separate sittings.

Because the test is adaptive, children are presented with questions based on their previous answers. ISEB says this means children don't spend time answering questions that are too hard or too easy, and the test can be shorter while still giving an accurate score. In our experience, broad underlying ability is more useful in preparation than drilling a fixed set of question types.

For boys at UK prep schools, Harrow says the school should be familiar with the test and will make arrangements for him to take it there. Boys at schools that do not routinely administer the test should ask their current school to supply a suitable testing room with a computer and internet access, along with an administrator to set up and supervise the test. Families should visit the ISEB website for current registration guidance and to understand exactly what to expect on test day.

Stage 2 — The Harrow Test: What Happens If Your Child Is Invited

Boys who reach the required standard in the ISEB Common Pre-Test and receive a strong confidential reference from their school are invited — by the end of December of Year 6 — to sit the Harrow Test. This second stage takes place at Harrow School itself in the spring term of Year 6 — January to March 2027 for boys now in Year 6. When invited, candidates are also asked to submit a hand-written CV.

It consists of three components.

The computerised English and Maths assessment (60 minutes total) is taken on screen at the school. Boys who have kept their academic work sharp throughout Year 6 and who are confident working at pace on screen will be best placed here.

The group activity (20 minutes) takes place in a classroom. In a group setting it helps to listen as attentively as you speak, build on others' contributions and help the group work well.

The Housemaster interview (20 minutes) is an interview with a House Master. Children who have a rich and authentic set of interests, who can talk about them with real enthusiasm and specific detail, and who can sustain a thoughtful two-way conversation, will find this stage plays directly to their strengths.

After the Harrow Test, results are communicated in late April or early May of Year 6. The school issues one of four outcomes: an A1 List (place offered in a specific House), an A2 List (place offered with House to be allocated later), a B List (Waiting List), or a C List (no offer). All offers are subject to the boy sitting either the Common Entrance (CE) examinations, in June of Year 8, or Harrow's Academic Scholarship examinations in Year 8.

What Is Harrow School Looking for at Stage 2?

Harrow is explicit about the qualities it seeks in new boys. Academic ability alone — even exceptional academic ability — is not sufficient. The school's admissions criteria list four dimensions: the ability to thrive in a boarding environment; the capacity to make a positive contribution to school life beyond the classroom; talent in academics, sport, the arts, or other areas; and a good behavioural record combined with the potential to lead.

In the group activity, it helps to show intellectual curiosity — engaging with the task with genuine interest — and collaborative spirit — listening to others as well as contributing, building on what others say rather than redirecting every comment to himself, and helping the group function better. These qualities are hard to fake in a 20-minute group activity. They come from genuine character and, to some extent, from a childhood rich in collaborative activities: team sports, group music-making, debating, shared projects.

In the Housemaster interview, authenticity matters. A boy who has real passions — a book series he has followed with genuine enthusiasm, a sport he has practised with commitment, a historical period he has read about beyond the classroom, a scientific problem he finds fascinating — will have specific, vivid, personal things to say. Help your son prepare by encouraging him to reflect on what genuinely matters to him — not what sounds impressive.

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How to Prepare for Each Stage of the Harrow Assessment

Stage 1 — ISEB Common Pre-Test preparation. For most families targeting Harrow School, serious preparation for the ISEB should begin well before the autumn term of Year 6, when standard applicants sit it. The four ISEB subjects each require a different preparation approach. For verbal reasoning, regular reading of varied, challenging texts builds the vocabulary, inference and analogy skills the test rewards — this is a slow, long-term build, not something that can be accelerated with a few weeks of drilling. For non-verbal reasoning, structured practice with pattern and spatial reasoning tasks is essential, because these question types need adequate time to build genuine facility with them. For mathematics, strong fluency with the primary-school maths curriculum — fractions, decimals, percentages, ratios, geometry and problem-solving — applied quickly and accurately under time pressure, is the foundation. Timed, screen-based practice that mirrors the computer-delivered adaptive format should begin once subject knowledge is solid, to build the specific stamina and composure the test demands.

Stage 2 — Harrow Test preparation. Once a boy receives his invitation to the Harrow Test, preparation should focus on the three Stage 2 components. For the computerised English and Maths assessment, keeping academic work sharp throughout Year 6 and building comfort with timed tasks on screen is the right approach — boys who have been well-prepared for Stage 1 will already be in good shape for the academic elements of Stage 2. For the group activity, boys who regularly participate in team sports, school debating or drama, music groups, collaborative projects, or other activities where listening and contributing are both valued will find this component comes more naturally. Even boys who are quieter by nature can develop the skills of building on others' ideas and contributing at the right moment — it is something that can be practised and coached. For the Housemaster interview, the most important preparation is long-term: the cultivation of genuine, specific interests that the boy can talk about with real knowledge and enthusiasm. Mock interview practice in the weeks before the test can help him organise his thoughts, practise speaking clearly and conversationally with an adult he does not know well, and learn to respond to follow-up questions without becoming flustered.

For the handwritten CV, encourage your son to think about what genuinely matters to him: what he has achieved, what he is proud of, what he does outside school, what he has read. Keep the CV short, honest and in the boy's own voice, rather than a long, polished document that reads as though a parent wrote it. Help him identify the content; let him write it himself.

How Competitive Is Harrow School Entry?

Harrow School admits around 160 boys per year into Year 9, spread across 12 boarding Houses.

Harrow invites boys who reach the required standard in the ISEB Common Pre-Test, and for whom it has received a strong supporting reference, to the Harrow Test. Harrow's FAQs say a small number of applicants who do not perform well in the ISEB Pre-Test are de-selected, while the majority are invited to the Harrow Test. Of those who sit the Harrow Test, results are issued as A1, A2, B or C Lists, and the distinction between an A1 List place (specific House offered) and an A2 List place (House to be allocated later) is meaningful: boys holding an A1 place are invited to a one-to-one meeting with the House Master from the summer term of Year 6 onwards. A B List outcome is an offer of a place on Harrow's Waiting List.

All offers — A1 and A2 alike — are subject to sitting either Common Entrance (CE) in June of Year 8 or Harrow's Academic Scholarship examinations in Year 8. Harrow says there is no set pass mark for CE and that results are used to determine a boy's initial sets; a boy who performs very well in the Academic Scholarship examinations is unlikely to be required to sit the CE examinations. The registration fee of £450 is non-refundable, so families should be confident before registering that Harrow School is a genuine target.

How Leading Tuition Supports Harrow School and John Lyon Preparation

Leading Tuition provides specialist 1-to-1 tutoring for both stages of the Harrow School admissions process and for John Lyon School entry at 11+. For Stage 1, our tutors build genuine ability across all four ISEB components — verbal and non-verbal reasoning, English, and Mathematics — through structured, personalised programmes that identify each child's specific gaps and work systematically to address them. We conduct timed, screen-based mock assessments that replicate the adaptive format of the ISEB, so that children arrive on test day with the composure and stamina that the assessment rewards.

For Stage 2, we provide targeted preparation for each component of the Harrow Test. For the computerised English and Maths assessment, we build and maintain the academic skills and on-screen confidence boys need under timed conditions. For the group activity, we run structured coaching sessions that help boys practise the collaborative and communicative skills Harrow is looking for — listening, building, contributing at the right moment. For the Housemaster interview, we run mock interviews that help boys organise and articulate their genuine interests clearly, hold a thoughtful conversation with an adult they do not know, and manage the natural nerves that come with an interview.

We also work with families on the handwritten CV — not by writing it for the boy, but by helping him identify what matters most and find the words to say it authentically. Our students have achieved a 95%+ offer rate across selective school entry. Book a free consultation to discuss a tailored preparation plan for your son's timeline and target schools.

Leading Tuition is rated 4.8 out of 5 on Trustpilot from 59 reviews, read on 3 October 2026, and 91% of our students achieve their desired grades.

Leading Tuition on Trustpilot

Leading Tuition is rated 4.8 out of 5 on Trustpilot from 59 reviews, read on 3 October 2026, and 91% of our students achieve their desired grades.

Reviewed October 2026: dates, figures and rules checked against Harrow School's Year 9 entry, key dates, admissions process and FAQ pages, John Lyon School's 11+ page, ISEB's Pre-Tests page and Harrow Council's secondary application page.

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Further reading: 11+ Tuition at Leading Tuition | Harrow School 13+ Guide | All Borough Guides | Tutoring in Harrow

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