The Costello School
About The Costello School
The Costello School is a secondary school in Basingstoke, Hampshire, classified by the DfE as an academy converter. Around 1,222 pupils aged 11 to 16 attend the school. The school holds a 'Good' judgement from Ofsted (February 2026). The school's average Attainment 8 score in the latest GCSE results was 47.3 — broadly in line with the national average (national average: 46). Its Attainment 8 score has risen by 1.0 points year on year. On our composite score, which combines the DfE attainment measures above, this places it in the top 41% of secondary schools nationally.
50% of pupils achieved a grade 5 or above in both English and maths, above the national average of about 45%. 69% achieved a standard pass (grade 4+) in English and maths. When comparing schools, it is still worth visiting in person to see whether the atmosphere and approach suit your child. This overview is generated automatically from the latest published DfE performance tables and Ofsted data; figures are rounded, and you can check the originals via the official links further down the page.
Performance (KS4 GCSE)
Three-year trends
How each headline measure has moved across the last three years of published DfE data. Direction of travel, not a like-for-like ranking.
Ofsted judgements
School profile
Official sources
Verify the latest information directly from government services. We refresh from DfE performance tables annually — Ofsted reports change more frequently.