Aylesbury Grammar School: 11+ Entry Guide for Parents 2026

Aylesbury Grammar School (AGS) is a selective state grammar school for boys aged 11 to 18, located on Walton Road in Aylesbury, Buckinghamshire. It admits 186 boys into Year 7 each year via the Buckinghamshire Secondary Transfer Test (STT), administered by GL Assessment. The school was founded in 1598, holds specialist status in Science and Languages, and was rated Outstanding across all areas at its last Ofsted inspection in November 2019. Entry is competitive: boys must achieve the qualifying standard on the STT and, where the school is oversubscribed, meet the catchment area and admissions criteria. This guide covers the test format, 2026 key dates, catchment area, admissions criteria, and how to structure preparation properly.

What Is the Buckinghamshire Secondary Transfer Test?

The Buckinghamshire Secondary Transfer Test (STT) is the shared entrance assessment used by all 13 grammar schools in Buckinghamshire, administered by The Buckinghamshire Grammar Schools (TBGS) using GL Assessment materials. A child who passes the STT is eligible to apply to any of the 13 schools — there is no separate school-specific exam for Aylesbury Grammar School. This means your son sits one test, and his score determines eligibility across the whole Buckinghamshire grammar school system.

The test consists of two papers, each lasting approximately 60 minutes, with a break between them. Both papers are multiple-choice. Scores are age-standardised and combined to produce a Secondary Transfer Test Score (STTS). The weighting across the two papers is: 50% verbal ability, 25% numerical ability, and 25% non-verbal reasoning. This weighting directly shapes how preparation time should be allocated — verbal work deserves the greatest share of attention.

Paper 1 tests verbal skills and covers three components: English comprehension (reading a passage and answering questions about it), technical English (grammar, punctuation, and sentence structure questions), and verbal reasoning (word codes, analogies, letter sequences, and pattern-recognition questions involving language). Paper 2 tests non-verbal skills and covers mathematics (Key Stage 2 curriculum topics with an emphasis on problem-solving) and non-verbal reasoning (shapes, spatial patterns, matrices, and abstract sequences).

Results are age-standardised before being combined. This means a child born in August is not disadvantaged relative to a child born in September — the scoring system adjusts for age at the time of taking the test. The qualifying standard is typically a standardised score of 121, though this figure is not fixed and can vary slightly year to year based on overall cohort performance.

Item	Details
Entry year	Year 7 (September 2027 for boys currently in Year 5)
Year 7 places	186
Test	Buckinghamshire Secondary Transfer Test (STT), GL Assessment
Test format	2 papers × 60 minutes, multiple-choice, age-standardised
Paper 1	Comprehension, technical English, verbal reasoning (50% of total)
Paper 2	Mathematics and non-verbal reasoning (50% of total)
Typical qualifying score	121 (standardised; may vary slightly year to year)
Test date 2026	Thursday 10 September 2026
Results	Thursday 9 October 2026
Application deadline (CAF)	Saturday 31 October 2026
School type	Boys' selective state grammar school
Ofsted	Outstanding (all areas, November 2019)

How Competitive Is Entry to Aylesbury Grammar School?

Approximately 9,500 children sit the Buckinghamshire STT each year across the county, competing for around 1,900 grammar school places across all 13 Buckinghamshire grammar schools — a county-wide pass rate of approximately one in five. Aylesbury Grammar School, with 186 Year 7 places, is one of the larger grammar schools in Buckinghamshire. However, it is located alongside two other grammar schools on or near Walton Road in central Aylesbury — Aylesbury High School (girls, 0.8 miles) and Sir Henry Floyd Grammar School (mixed, 0.3 miles) — meaning competition for grammar school places in the Aylesbury area is concentrated and intense.

Reaching the qualifying standard of 121 is necessary but not sufficient. In years where Aylesbury Grammar is oversubscribed — which is typical — the admissions criteria determine who receives an offer. Boys in the catchment area are prioritised over out-of-catchment applicants at the same score. Within catchment, tie-breaking is by distance to the school. A boy scoring well above 121 who lives in catchment is in the strongest position. A boy scoring exactly 121 from outside catchment faces real uncertainty.

The practical implication for preparation is clear: scoring comfortably above the threshold matters. Families whose sons are likely borderline should consider whether intensive, structured preparation can meaningfully move a child from, say, a score of 118 to 123 — which it can, particularly if preparation starts early enough to address genuine curriculum or reasoning gaps rather than just drilling practice papers in the final weeks.

What Does the STT Actually Test? A Paper-by-Paper Breakdown

Paper 1: Verbal Skills has three distinct components that many families conflate. Comprehension requires your son to read an unseen passage — typically a piece of narrative or non-fiction prose — and answer multiple-choice questions that test inference, vocabulary in context, and understanding of the author's purpose. Comprehension rewards regular reading; boys who read widely from Year 3 onwards develop the vocabulary range and reading stamina that makes this section feel natural rather than effortful.

Technical English is the component that surprises many families because it does not appear in typical primary school assessments. Questions cover: identifying grammatically incorrect sentences, selecting the correctly punctuated version of a sentence, identifying the type of clause or phrase, choosing the correct word form (verb tense, adjective/adverb distinction), and other applied grammar questions. These are learnable with specific practice and should be introduced deliberately — they are not skills children absorb passively from reading alone.

Verbal reasoning covers question types including: word codes (e.g. if CAT = 3120, what does DOG equal in the same code?), word analogies (apple is to fruit as daisy is to ___), inserting a word that fits both a suffix and a prefix context, identifying the word that does not belong to a group, letter sequences following a rule, and others. GL Assessment uses a consistent set of verbal reasoning formats, so these are highly learnable once your son has been systematically introduced to each type.

Paper 2: Non-Verbal and Mathematical Skills begins with mathematics. The maths section covers the Key Stage 2 curriculum but with an emphasis on problem-solving rather than recall: multi-step word problems, fractions, decimals, percentages, ratio and proportion, area, perimeter, angles, coordinates, and data interpretation (charts, graphs, tables). Speed matters — boys who have practised maths in timed conditions consistently outperform those who have only done untimed work, even where underlying knowledge is similar.

Non-verbal reasoning tests spatial awareness and abstract pattern recognition: identifying which shape completes a sequence, which pattern is the mirror image of another, which shape belongs to a group, and how a shape would look after rotation. This component is less tied to curriculum content than maths or comprehension, which is why many families underestimate it. The good news is that NVR question formats are consistent and learnable; boys who have been shown each format and understand the underlying logic perform significantly better than those who encounter question types for the first time in the actual exam.

When Should You Start Preparing for the Bucks 11+?

Most families whose sons successfully enter Aylesbury Grammar School begin structured preparation in Year 4 or early Year 5 — roughly 12 to 18 months before the September test. This timeframe is not about working harder than other families; it is about working smarter and earlier, so that the final months before the test are about refinement and confidence rather than desperate catch-up.

A well-structured preparation programme for AGS typically runs in three phases. In the first phase (Year 4 to early Year 5), the focus is on building foundations: introducing all the verbal and non-verbal reasoning question types for the first time, addressing any gaps in the KS2 maths curriculum, and establishing a consistent reading habit that supports both comprehension and technical English. Boys who have never seen a verbal reasoning question before Year 5 are not disadvantaged if preparation starts at this point — these are all learnable skills, not fixed abilities.

In the second phase (middle of Year 5 to about June), the focus shifts to timed practice: working through practice papers under realistic time constraints, learning how to manage pace across both papers, identifying which question types are reliably strong and which still need attention. This phase is where a good tutor earns their value — identifying the specific gap (is it the comprehension? The codes in verbal reasoning? Long division in the maths section?) and addressing it directly, rather than having your son repeat sections he already does well.

In the third phase (June to September of Year 6), the work is about consolidation: mock tests under exam conditions, building the mental stamina to perform well for two hours, and managing test-day nerves. Boys who enter September having done this consistently are calm, prepared, and performing close to their ceiling. Boys who begin in this final phase are cramming — and cramming alone rarely lifts a score from below the qualifying standard to above it in a matter of weeks.

One important practical note: boys at Buckinghamshire state-funded primary schools are registered for the STT automatically, and parents who do not want their son to sit must actively withdraw him before the registration deadline. Boys at independent schools or schools outside Buckinghamshire must register manually during the registration window (1 May to 2 June 2026). Missing this window means your son cannot sit the test that year.

Catchment Area and Admissions Criteria: What Parents Need to Know

Aylesbury Grammar School has a defined catchment area used in its oversubscription criteria when more boys meet the qualifying standard than there are places available. The catchment area covers: Aylesbury, Princes Risborough, Long Crendon, Ludgershall, Stewkley, and Edlesborough. A map of the catchment area is available on the school website. If your home address falls within this area, your son benefits from higher priority in the allocation process.

When the school is oversubscribed, places are allocated in the following order: first, looked-after and previously looked-after children; second, boys in catchment who receive Pupil Premium; third, siblings of current pupils who live in catchment; fourth, boys with exceptional medical or social needs (supported by written evidence); fifth, sons of current AGS staff; sixth, all other boys living in the catchment area, prioritised by distance to school; seventh, siblings of current pupils who live outside catchment; eighth, all other qualifying applicants, by distance to school. Within any tie, the child living closer to the school is prioritised.

Families living outside the catchment area can and do secure places at Aylesbury Grammar School — but they must score sufficiently well that their position in the eighth-tier group (all other qualifying applicants, by distance) still brings them inside the offer cut-off. In years where the school fills up within the catchment, out-of-catchment applicants at 121 may not receive an offer. Out-of-catchment applicants who score 128 or above are generally in a strong position across most years, though there are no guarantees.

Parents should always download the current year's admissions policy from the official Aylesbury Grammar School admissions page and check the TBGS website for the latest STT guidance. The Governing Body consulted on proposed amendments to the admissions policy for 2027 entry in autumn 2025 — it is worth checking whether any changes have been finalised.

What Do High-Scoring Boys Do Differently?

Having worked with many boys preparing for AGS, our tutors observe consistent patterns among those who score well above the qualifying standard versus those who narrowly pass or fall short. The differences are not primarily about innate ability — they are about preparation quality and consistency.

They have specifically practised technical English. This is the component most commonly underweighted in preparation. Many families focus heavily on verbal reasoning and maths but give little attention to grammar and punctuation questions. Boys who have worked through technical English exercises regularly — identifying sentence errors, selecting correctly punctuated options — find Paper 1 substantially less daunting and score more consistently across all three of its components.

They understand verbal reasoning question types before encountering them. GL Assessment verbal reasoning follows a consistent set of formats. Boys who have been taught each format explicitly — shown the logic, worked through examples correctly, and practised until the format feels routine — outperform boys who have only guessed their way through practice papers. Understanding why the answer is correct matters more than repeated exposure to questions where the answer is given without explanation.

They have read widely and consistently for at least a year. The comprehension section of Paper 1 rewards breadth of reading more than specific exam preparation. Boys who read regularly — fiction, non-fiction, newspapers, longer pieces — develop the vocabulary range and reading stamina needed to process an unseen passage quickly and accurately. This cannot be manufactured in the final weeks before the test. It is built over months.

They practise maths in timed conditions from early in Year 5. The maths section of Paper 2 is not conceptually harder than strong KS2 content, but it is taken under time pressure. Boys who have drilled maths in timed sessions — working through problem sets with a clock — develop the automatic recall of number facts and the habit of checking their working that produces reliable scores. Boys who have only done untimed maths homework find the paced nature of the test disproportionately difficult.

Their parents have kept preparation calm and consistent. The boys who perform closest to their ceiling on test day are those whose families have maintained steady encouragement without generating excessive anxiety. The STT is a significant assessment, but it is taken by ten-year-olds in the same September morning session as every other Bucks grammar school candidate. A calm, well-prepared boy who walks in on 10 September 2026 having done consistent practice throughout Year 5 is in the best possible position.

How Does Aylesbury Grammar Compare to Other Buckinghamshire Grammar Schools?

All 13 Buckinghamshire grammar schools use the same STT, so a boy who qualifies is technically eligible to apply to any of them. What determines which school he attends is the preference order on the common application form and, where schools are oversubscribed, whether he meets the relevant admissions criteria. Families in the Aylesbury area most commonly consider AGS alongside Sir Henry Floyd Grammar School (mixed, 0.3 miles from AGS on Oxford Road) and Aylesbury High School (girls-only, 0.8 miles on Walton Road).

AGS and Sir Henry Floyd are the two grammar schools closest to each other in Buckinghamshire — they are effectively next door. The principal practical difference is that AGS is boys-only while Sir Henry Floyd is mixed. Both are Outstanding-rated, both are on the Aylesbury bus routes, and both draw from similar catchment areas. Families of boys who have a preference for a single-sex environment typically list AGS first; those who prefer co-educational learning typically list Sir Henry Floyd. In most years, a boy who qualifies but does not get his first-choice Aylesbury grammar school will receive an offer from the other Aylesbury grammar school if he has listed it as a preference.

For families further afield in Buckinghamshire, other well-regarded schools include Dr Challoner's Grammar School in Amersham (boys, Outstanding), John Hampden Grammar School in High Wycombe (boys), Wycombe High School (girls, High Wycombe), and the Royal Latin School in Buckingham (mixed). All operate on the same STT pass, but each has its own catchment area and admissions criteria. We cover all of these schools in our wider guide to grammar school preparation for 2026. For a detailed breakdown of the GL Assessment question formats your son will encounter, see our GL Assessment 11+ parent guide. For practical advice on how to structure the preparation process from Year 4, see our guide to passing the 11+.

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