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Yes, some schools really do assess three-year-olds. The 4+ and 7+ entry system is peculiar, stressful, and concentrated almost entirely in London and the Home Counties. This guide explains how it works, which schools use it, and what actually matters — so you can navigate the process without losing perspective.
Key facts
10:1
Applicants per place at top London schools
Age 3
Youngest children assessed for 4+ entry
200+
Schools using 4+ or 7+ assessments
3 hrs
Exam time at some 7+ schools
A 4+ assessment is the entry process for Reception at an independent pre-prep or prep school. Your child will be 3 years old when assessed. Let’s be clear about what that means: a toddler, barely out of nappies, is being observed in a structured setting to determine school placement. It is, by any objective measure, absurd — and yet it is the system that hundreds of families navigate every year.
The uncomfortable truth
Assessing a three-year-old is inherently unreliable. A child’s performance on any given day depends on sleep, mood, whether they had a tantrum in the car park, and pure chance. Schools know this. The process selects for a narrow band of “socially ready” children — which correlates with birth month, parental education, and nursery quality more than with any innate ability. A rejection at 4+ tells you nothing meaningful about your child.
The 7+ is a different beast entirely. At age 6–7 children sit formal written exams, and at the most competitive schools the testing is substantial. This is the main entry point for many of London’s top prep schools.
Exam duration at competitive schools
Westminster Under School: approximately 2.5 hours of testing plus interview. Colet Court (St Paul’s Juniors): 2–3 hours across multiple papers. King’s College School Wimbledon: approximately 2 hours plus interview. For a six-year-old, this is a marathon. Schools build in breaks, but it is still a long and tiring day.
Every school runs its own admissions process. These are some of the most sought-after, with what to expect.
Missing a registration deadline is the most common — and most preventable — reason families miss out. Some schools close their lists years in advance.
The 4+/7+ pressure is overwhelmingly a London phenomenon. If you live outside the M25, the landscape is considerably calmer.
Central London (Kensington, Chelsea, Westminster)
8–12 applicants per place at top schools. Birth registration common. Professional tutoring industry thrives here.
South-West London (Putney, Wimbledon, Barnes)
6–10 applicants per place. Strong cluster of prep schools. Slightly less frenzied than central but still intensely competitive.
Home Counties (Surrey, Herts, Bucks)
4–6 applicants per place at popular schools. Less pressure than London but still requires early registration and preparation.
Elsewhere in England, Scotland, Wales
2–4 applicants per place. More relaxed timelines. Some schools have no waiting list at all for 4+ entry.
Should you tutor a three-year-old? The honest answer is no — but the full picture is more nuanced than that.
Rejection hurts, but it is far more common than acceptance at these schools. Here’s what to do next.
Sources
This guide draws on admissions information published by individual schools (Westminster Under, Thomas’s, Colet Court, Hampton Prep, King’s College School Wimbledon), the Independent Schools Council (ISC) census 2025, the Good Schools Guide, and guidance from the Independent Association of Prep Schools (IAPS). This guide is for general information only. Admissions policies, inspection frameworks, and school structures change regularly — always verify current details with the relevant school, local authority, or official body. Last reviewed April 2026.
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