St Mary's School is an Independent school (Other independent school) with a Anglican religious character. The school consists of girls aged between 3 and 18 and has a capacity of 350.

This school has strong academic results. It is in the top 30% of Secondary schools in England based on Key Stage 4 GCSE performance and ranking according to the Attainment 8 score (how well pupils of the school have performed in up to 8 qualifications). It is also in the top 20% of Secondary schools in England based on Key Stage 5 (A-Level and equivalent) performance and ranking according to the Average Point Score (how well pupils of the school have performed in their Academic qualifications).