SchoolScoresBest secondary schools in Isleworth
How this list works. Ranked by the percentage of pupils achieving grade 5 or above in both English and maths GCSE, averaged over up to the last three years and weighted by the number of pupils each year. Only years with at least 10 pupils count, and a school needs at least one such year to be ranked. Independent schools, special schools and alternative provision are not ranked because their results aren't comparable. Ofsted outcomes are shown alongside but are not part of the ranking. Full methodology.
| # | School | Result |
|---|---|---|
| 1 | Gumley House RC Convent School, FCJ Ofsted: Good (2018), confirmed 2024 | 71% |
| 2 | The Green School for Girls Ofsted: Good (2023) | 64% |
| 3 | The Green School for Boys Ofsted: Good (2020), confirmed 2025 | 52% |
| 4 | Bolder Academy Ofsted: Good (2022) | 45% |
| 5 | Isleworth and Syon School for Boys Ofsted: Good (2023) | 41% |
Result: grade 5 or above in English and maths. Source: DfE school performance tables to 2025; Ofsted inspection data.
Page updated 26 September 2026.