| 1 | Reading School | 74.2 composite | Grammar · Boarding · 6th | Reading, South East | Outstanding 2023-11-21 |
| 2 | Dr Challoner's Grammar School | 62.3 composite | Grammar · Day · 6th | Amersham, South East | Outstanding 2019-11-05×0.7 |
| 3 | Aylesbury Grammar School | 58.2 composite | Grammar · Day · 6th | Aylesbury, South East | Outstanding 2022-11-02×0.85 |
| 4 | John Hampden Grammar School | 57.1 composite | Grammar · Day · 6th | High Wycombe, South East | Outstanding 2022-09-14×0.85 |
| 5 | Sir Joseph Williamson's Mathematical School | 57.0 composite | Grammar · Day · 6th | Rochester, South East | Outstanding 2023-03-21×0.85 |
| 6 | Glyn School | 55.1 composite | Academy · Day · 6th | Epsom, South East | Outstanding 2023-09-12 |
| 7 | The Royal Grammar School, High Wycombe | 54.2 composite | Grammar · Boarding · 6th | High Wycombe, South East | Good 2019-10-09×0.7 |
| 8 | The Skinners' School | 53.8 composite | Grammar · Day · 6th | Tunbridge Wells, South East | Good 2021-11-16×0.85 |
| 9 | Dartford Grammar School | 53.5 composite | Grammar · Day · 6th | Dartford, South East | Outstanding 2022-12-06×0.85 |
| 10 | Northfleet Technology College | 49.3 composite | State · Day · 6th | Gravesend, South East | Good 2022-09-21×0.85 |
| 11 | Leigh Academy Tonbridge | 47.5 composite | Academy · Day · 6th | Tonbridge, South East | Good 2022-12-06×0.85 |
| 12 | The Norton Knatchbull School | 45.5 composite | Grammar · Day · 6th | Ashford, South East | Good 2023-12-13 |
| 13 | The Judd School | 45.0 composite | Grammar · Day · 6th | Tonbridge, South East | — 2025-03-11 |
| 14 | The Forest School | 39.9 composite | Academy · Day · 6th | Wokingham, South East | Good 2021-06-29×0.85 |
| 15 | Desborough College | 37.6 composite | Academy · Day · 6th | Maidenhead, South East | — 2024-05-17 |
| 16 | Gravesend Grammar School | 31.8 composite | Grammar · Day · 6th | Gravesend, South East | — 2025-03-18 |
| 17 | Tunbridge Wells Grammar School for Boys | 30.5 composite | Grammar · Day · 6th | Tunbridge Wells, South East | — 2021-11-25 |
| 18 | Maidstone Grammar School | 29.3 composite | Grammar · Day · 6th | Maidstone, South East | — 2024-10-09 |
| 19 | St Birinus School | 29.1 composite | Academy · Day · 6th | Didcot, South East | — 2025-02-04 |
| 20 | Simon Langton Grammar School for Boys | 29.0 composite | Grammar · Day · 6th | Canterbury, South East | — 2024-11-26 |
| 21 | The Windsor Boys' School | 28.8 composite | Academy · Day · 6th | Windsor, South East | — 2023-05-11 |
| 22 | Oakwood Park Grammar School | 28.7 composite | Grammar · Day · 6th | Maidstone, South East | — 2024-05-02 |
| 23 | Wilmington Grammar School for Boys | 26.8 composite | Grammar · Day · 6th | Dartford, South East | — 2023-03-14 |
| 24 | The Harvey Grammar School | 26.6 composite | Grammar · Day · 6th | Folkestone, South East | — 2022-12-14 |
| 25 | Borden Grammar School | 26.5 composite | Grammar · Day · 6th | Sittingbourne, South East | — 2021-11-24 |