Last updated 28 September 2026
School Guide verdict
St John's Preparatory and Senior School is an independent mixed secondary in Potters Bar, where every pupil achieves good GCSE passes—sitting well above the national average and earning it a 5-star rating from School Guide. At its 2019 inspection, Ofsted graded the school Outstanding.
Top grades at GCSE (7-9) and top grades at A level (A*/A)
This shows current pupil progress from the end of GCSE to A level compared to other pupils in England. This “value added” data measures academic development from one key stage to the next
Responses taken from Ofsted Parent View
This school is independently managed and its admission criteria may be selective. There is no set catchment area as pupils are admitted from a wide variety of postcodes and, in the case of boarding schools, from outside the UK. Contact the school directly or visit their website for more information on Admissions Policy and Procedures.
St John's Preparatory and Senior School was rated Outstanding by Ofsted in 2019.
Pupils achieve good GCSE passes (5+ GCSEs grade 9-4 including English and maths) at 100%, which is well above the national average of 38.9%.
There are 493 pupils attending the school.
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