| 1 | Dr Challoner's High School | 68.8 compositeOfsted18.0 AAB%7.3 VA9.7 Att815.8 EM5+17.9 | Grammar · Day · 6th | Amersham, South East | Outstanding 2023-11-21 |
| 2 | Langley Grammar School | 68.3 compositeOfsted15.3 AAB%9.7 VA10.1 Att815.5 EM5+17.7 | Grammar · Day · 6th | Langley, South East | Outstanding 2021-11-24×0.85 |
| 3 | Kendrick School | 68.0 compositeOfsted15.3 AAB%9.3 VA8.6 Att816.8 EM5+18.0 | Grammar · Day · 6th | Reading, South East | Outstanding 2022-11-08×0.85 |
| 4 | Dartford Grammar School | 67.4 compositeOfsted17.6 VA10.8 Att818.4 EM5+20.5 | Grammar · Day · 6th | Dartford, South East | Outstanding 2022-12-06×0.85 |
| 5 | Sir William Borlase's Grammar School | 67.4 compositeOfsted18.0 AAB%8.0 VA9.5 Att814.5 EM5+17.4 | Grammar · Day · 6th | Marlow, South East | Outstanding 2024-05-01 |
| 6 | Herschel Grammar School | 66.7 compositeOfsted18.0 AAB%7.2 VA8.6 Att815.2 EM5+17.8 | Grammar · Day · 6th | Slough, South East | Outstanding 2024-05-21 |
| 7 | St Bernard's Catholic Grammar School | 66.2 compositeOfsted18.0 AAB%5.8 VA9.3 Att815.5 EM5+17.7 | Grammar · Day · 6th | Slough, South East | Outstanding 2023-11-07 |
| 8 | Tunbridge Wells Girls' Grammar School | 66.1 compositeOfsted18.0 AAB%5.2 VA10.6 Att814.7 EM5+17.6 | Grammar · Day · 6th | Tunbridge Wells, South East | Outstanding 2023-09-19 |
| 9 | Upton Court Grammar School | 65.9 compositeOfsted15.3 AAB%7.3 VA9.4 Att816.0 EM5+17.9 | Grammar · Day · 6th | Slough, South East | Outstanding 2022-11-29×0.85 |
| 10 | Dr Challoner's Grammar School | 65.7 compositeOfsted12.6 AAB%10.4 VA10.6 Att814.8 EM5+17.3 | Grammar · Day · 6th | Amersham, South East | Outstanding 2019-11-05×0.7 |
| 11 | Aylesbury High School | 65.6 compositeOfsted18.0 AAB%6.0 VA8.9 Att814.9 EM5+17.8 | Grammar · Day · 6th | Aylesbury, South East | Outstanding 2023-12-05 |
| 12 | Sir Henry Floyd Grammar School | 64.5 compositeOfsted18.0 AAB%5.4 VA9.0 Att814.6 EM5+17.5 | Grammar · Day · 6th | Aylesbury, South East | Outstanding 2024-02-20 |
| 13 | Wycombe High School | 64.5 compositeOfsted18.0 AAB%5.0 VA9.3 Att814.8 EM5+17.4 | Grammar · Day · 6th | High Wycombe, South East | Outstanding 2024-04-30 |
| 14 | Invicta Grammar School | 64.0 compositeOfsted18.0 AAB%4.7 VA10.5 Att814.2 EM5+16.7 | Grammar · Day · 6th | Maidstone, South East | Outstanding 2024-04-16 |
| 15 | Tonbridge Grammar School | 63.7 compositeOfsted14.5 VA11.0 Att817.8 EM5+20.4 | Grammar · Day · 6th | Tonbridge, South East | Outstanding 2019-10-16×0.7 |
| 16 | Aylesbury Grammar School | 63.5 compositeOfsted15.3 AAB%6.4 VA9.7 Att814.9 EM5+17.1 | Grammar · Day · 6th | Aylesbury, South East | Outstanding 2022-11-02×0.85 |
| 17 | Royal Latin School | 63.2 compositeOfsted11.5 AAB%9.4 VA10.6 Att814.7 EM5+17.1 | Grammar · Day · 6th | Buckingham, South East | Good 2022-11-15×0.85 |
| 18 | John Hampden Grammar School | 62.9 compositeOfsted15.3 AAB%5.7 VA9.9 Att814.5 EM5+17.6 | Grammar · Day · 6th | High Wycombe, South East | Outstanding 2022-09-14×0.85 |
| 19 | The Judd School | 62.5 compositeAAB%12.9 VA11.0 Att818.1 EM5+20.4 | Grammar · Day · 6th | Tonbridge, South East | — 2025-03-11 |
| 20 | St Andrew's Catholic School | 62.4 compositeOfsted18.0 AAB%6.3 VA10.5 Att813.0 EM5+14.5 | Academy · Day · 6th | Leatherhead, South East | Outstanding 2024-05-22 |
| 21 | Sir Joseph Williamson's Mathematical School | 61.5 compositeOfsted15.3 AAB%5.0 VA10.5 Att813.9 EM5+16.8 | Grammar · Day · 6th | Rochester, South East | Outstanding 2023-03-21×0.85 |
| 22 | Hinchley Wood School | 61.3 compositeOfsted18.0 AAB%4.8 VA11.0 Att812.9 EM5+14.6 | Academy · Day · 6th | Esher, South East | Outstanding 2023-10-03 |
| 23 | St Peter's Catholic School | 61.1 compositeOfsted24.7 Att817.4 EM5+19.0 | Academy · Day · 6th | Guildford, South East | Outstanding 2024-05-15 |
| 24 | Beaconsfield High School | 60.5 compositeOfsted12.6 AAB%5.4 VA9.5 Att815.2 EM5+17.9 | Grammar · Day · 6th | Beaconsfield, South East | Outstanding 2019-12-11×0.7 |
| 25 | Gillotts School | 60.2 compositeOfsted24.7 Att816.8 EM5+18.7 | Academy · Day | Henley-on-Thames, South East | Outstanding 2023-06-27 |