St Mary's School
School summary
Founded in 1872, St Mary's is a small independent day school for girls in Gerrards Cross, educating around 440 pupils across the full age range from 3 to 18. Its Anglican character and modest size lend it an intimate feel, a quality reflected in the Independent Schools Inspectorate's judgement of 'excellent' for both quality of education and personal development. The compact sixth form of 52 students suggests close attention in the final years. With a notably high proportion of pupils receiving SEN support, the school appears geared towards individual care rather than a one-size-fits-all approach.
Where every mark matters.
Places are limited and demand is high, so exam performance is what sets candidates apart. Passmate turns the months ahead into ten focused minutes a day on the exact topics this school tests.
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Latest results
GCSE grade 9-7
50%
National average 23%
A-level A*-A
64%
National average 28%
Inspection reports
- ISI rating
- excellent
- ISI personal development
- excellent
- Last inspected
- 4 November 2024
Teaching & academics
Academic results stand well above national benchmarks: half of GCSE entries reach grades 9-7, against a national average of 23 per cent, and 64 per cent of A-level grades are A*-A, more than double the national figure of 28 per cent. The curriculum runs through GCSE and A-level, with an EPQ available for those wanting to stretch independent research skills. Popular A-level choices include Psychology, Sociology, Mathematics and Economics, while GCSE options span the sciences, humanities, languages and creative subjects such as Drama and Art & Design.
Languages
GCSE subjects
Head · Mrs Patricia Adams
Sixth form
- Sixth-form pupils
- 52
Popular A-level subjects
Qualifications offered
Beyond the classroom
Sport centres on netball, gymnastics and badminton. The school's scholarship programme signals breadth beyond the classroom, with awards in art, music, drama, sport and dance alongside academic recognition, and dance scholarships offered at 16.
Main sports
School life & ethos
- Founded
- 1872
- Religious character
- Anglican
- Boarding
- No
- SEN support
- 44.42%
- EHC plans
- 2.28%
Mobile phone policy
No mobile phones allowed in prep. Senior house students must hand phones in at the beginning of each day and collect at the end. Sixth form allowed to use phones in certain areas in designated Sixth Form centre but nowhere else in school.
Fees & bursaries
- Day fees (per year)
- £13,104 - £26,676
Small number of means-tested bursaries available
Schools nearby
Thorpe House School
Gerrards Cross, South East
International School of Creative Arts (ISCA)
Wexham, South East
High March School
Beaconsfield, South East
Royal Masonic School for Girls
Rickmansworth, East of England
ACS Hillingdon International School
Uxbridge, Greater London
Sikh Heritage Girls School
Slough, South East
Watch Passmate decide how to teach.
Answer as a child would. Left: what they see. Right: what it learns about them.
A small Anglican girls' school where strong results and an 'excellent' inspection meet a clear commitment to individual support. Families seeking an attentive, academically ambitious setting will find much to consider.
That’s where Passmate comes in. Tutoring is the most effective thing in a child’s preparation - a well-tutored child can outperform the vast majority of their peers. Passmate works alongside your tutor, not instead of them: it learns how your child thinks, finds the gaps, and shows the tutor exactly where to spend each session - so the limited time you have lands on what actually decides a place.
Works alongside your child’s tutor - not instead of them.
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St Mary's School 11+: frequently asked questions
Compiled from public data. Last checked 5 June 2026.