King's College Junior School (KCJS) in Wimbledon is one of south-west London's most prestigious prep schools — and one of the most academically selective 7+ entry points in the city. Entry is primarily at 7+ (Year 3), with boys progressing to King's College School (KCS) at 13. For families in Wimbledon, Richmond, Raynes Park and the surrounding areas, a place at KCJS is a major goal, and preparation needs to be well planned.
About King's College Junior School
KCJS occupies the same Wimbledon site as the senior school, with its own dedicated junior buildings on the Southside Common. The school educates around 450 boys from Year 3 to Year 8 in an environment that balances serious academic aspiration with a genuinely rich co-curricular programme — sport, music, drama and outdoor learning all feature prominently.
The majority of boys who join KCJS at 7+ progress to KCS Wimbledon at 13, which is consistently ranked among the top five boys' schools in the country by academic results. Entry via the junior school is more accessible than competing for a Year 9 place from an external prep school, making the 7+ a strategically important pathway for families who have KCS as a long-term goal.
The 7+ assessment
The assessment takes place in January of Year 2. Registration typically opens in the autumn term and closes in November; families should register promptly when the window opens. The assessment process includes:
- English — reading and writing activities. Boys are asked to demonstrate comprehension of a short text and to produce a piece of written work. At 7+, the school is looking for enthusiasm for language, clear thinking, and some ability to express ideas on the page.
- Mathematics — number tasks and practical problem-solving. Boys should be confident with addition and subtraction within 100, early multiplication concepts, and number patterns. The activities are designed to reveal mathematical thinking, not just procedural accuracy.
- Reasoning — verbal and non-verbal reasoning tasks appropriate for Year 2. These assess logical thinking and pattern recognition rather than curriculum knowledge.
- Interview — shortlisted candidates are invited for an informal interview. This is conversational in nature and assesses how a boy engages with questions, expresses enthusiasm and communicates his thinking.
How selective is it?
KCJS is highly selective. Around 40–50 places are available at 7+, and competition for those places is intense — particularly as KCS Wimbledon's reputation has continued to grow. Boys who receive offers typically read fluently and widely, are confident with numbers, and are articulate and curious in conversation.
Unlike some 7+ assessments, the KCJS interview is a meaningful part of the process. A boy who performs well on paper but struggles to communicate in person will find the interview difficult; similarly, a boy with good social skills and genuine interests can complement strong written work effectively.
When to start preparation
For the January Year 2 assessment, preparation with a specialist tutor typically begins in the September of Year 1 — four months before the exam date. Some families start earlier, particularly if they have identified specific areas (such as number confidence or reading stamina) that need more time to develop.
At this age, preparation should be enjoyable and varied. Sessions of 30–45 minutes are ideal; more than this is likely to be counterproductive with a 5–6 year-old. The goal is to build confidence and familiarity, not to create anxiety around a test.
What to work on
- Reading fluency and discussion. Read together daily, choosing books that stretch your child slightly. Talk about plots, characters and ideas — the ability to have a conversation about a book is excellent preparation for the reading and interview components.
- Writing with ideas. Encourage creative writing at home: short stories, descriptions of imaginary places, simple diary entries. Confidence on the page at 6 and 7 comes from enjoyment of writing, not from formal exercises.
- Mental arithmetic fluency. Number bonds to 20, times tables up to 5 or 6, and the ability to add and subtract two-digit numbers mentally. Games like number puzzles, card games involving counting, and cooking with measurements all build this naturally.
- Reasoning familiarisation. Non-verbal reasoning in particular — spotting patterns, sequences and spatial relationships — is unfamiliar to most children unless they have encountered it specifically. A small amount of structured practice with reasoning question formats makes a real difference.
- Interview confidence. Encourage your child to talk about their interests, to explain how things work, and to ask questions. The interview at KCJS is designed to be warm and relaxed, but a child who has never been asked to talk to an unfamiliar adult can find it daunting.
Preparing for the Year 3 starting point
It's worth noting that even boys who are not offered a place at 7+ can re-apply at 8+. KCJS also has some entry at other year groups where spaces arise. For families who do not secure a junior school place, the 11+ direct entry to KCS Wimbledon is another route — though significantly more competitive from external prep schools.
Finding a specialist tutor
The best 7+ tutors for KCJS are those who know the specific format of the assessment — including the interview component — and who are skilled at working with young children in a way that builds confidence without pressure. References from families who have successfully prepared for KCJS are the best guide.
Browse tutors with 7+ and early entry experience in West London, including Wimbledon, Richmond and Raynes Park, or search the parent portal for tutors matched to your specific requirements.