| 1 | Reading School | 97.4 compositeOfsted33.3 Att830.7 EM5+33.3 | Grammar · Boarding · 6th | Reading, South East | Outstanding 2023-11-21 |
| 2 | Dr Challoner's High School | 95.8 compositeOfsted33.3 Att829.3 EM5+33.2 | Grammar · Day · 6th | Amersham, South East | Outstanding 2023-11-21 |
| 3 | St Bernard's Catholic Grammar School | 94.7 compositeOfsted33.3 Att828.6 EM5+32.7 | Grammar · Day · 6th | Slough, South East | Outstanding 2023-11-07 |
| 4 | Herschel Grammar School | 94.3 compositeOfsted33.3 Att828.1 EM5+32.9 | Grammar · Day · 6th | Slough, South East | Outstanding 2024-05-21 |
| 5 | Aylesbury High School | 93.8 compositeOfsted33.3 Att827.5 EM5+33.0 | Grammar · Day · 6th | Aylesbury, South East | Outstanding 2023-12-05 |
| 6 | Tunbridge Wells Girls' Grammar School | 93.2 compositeOfsted33.3 Att827.2 EM5+32.6 | Grammar · Day · 6th | Tunbridge Wells, South East | Outstanding 2023-09-19 |
| 7 | Wycombe High School | 93.0 compositeOfsted33.3 Att827.4 EM5+32.3 | Grammar · Day · 6th | High Wycombe, South East | Outstanding 2024-04-30 |
| 8 | Sir Henry Floyd Grammar School | 92.8 compositeOfsted33.3 Att827.1 EM5+32.4 | Grammar · Day · 6th | Aylesbury, South East | Outstanding 2024-02-20 |
| 9 | Kendrick School | 92.8 compositeOfsted28.3 Att831.1 EM5+33.3 | Grammar · Day · 6th | Reading, South East | Outstanding 2022-11-08×0.85 |
| 10 | Sir William Borlase's Grammar School | 92.4 compositeOfsted33.3 Att826.8 EM5+32.2 | Grammar · Day · 6th | Marlow, South East | Outstanding 2024-05-01 |
| 11 | Upton Court Grammar School | 91.1 compositeOfsted28.3 Att829.6 EM5+33.1 | Grammar · Day · 6th | Slough, South East | Outstanding 2022-11-29×0.85 |
| 12 | Dartford Grammar School | 90.9 compositeOfsted28.3 Att829.6 EM5+33.0 | Grammar · Day · 6th | Dartford, South East | Outstanding 2022-12-06×0.85 |
| 13 | Invicta Grammar School | 90.5 compositeOfsted33.3 Att826.2 EM5+30.9 | Grammar · Day · 6th | Maidstone, South East | Outstanding 2024-04-16 |
| 14 | Langley Grammar School | 89.8 compositeOfsted28.3 Att828.7 EM5+32.8 | Grammar · Day · 6th | Langley, South East | Outstanding 2021-11-24×0.85 |
| 15 | John Hampden Grammar School | 87.7 compositeOfsted28.3 Att826.8 EM5+32.6 | Grammar · Day · 6th | High Wycombe, South East | Outstanding 2022-09-14×0.85 |
| 16 | Aylesbury Grammar School | 87.7 compositeOfsted28.3 Att827.6 EM5+31.7 | Grammar · Day · 6th | Aylesbury, South East | Outstanding 2022-11-02×0.85 |
| 17 | Mayfield Grammar School, Gravesend | 85.5 compositeOfsted33.3 Att823.8 EM5+28.4 | Grammar · Day · 6th | Gravesend, South East | Outstanding 2024-04-30 |
| 18 | Sir Joseph Williamson's Mathematical School | 85.2 compositeOfsted28.3 Att825.7 EM5+31.2 | Grammar · Day · 6th | Rochester, South East | Outstanding 2023-03-21×0.85 |
| 19 | Tonbridge Grammar School | 84.7 compositeOfsted23.3 Att828.6 EM5+32.8 | Grammar · Day · 6th | Tonbridge, South East | Outstanding 2019-10-16×0.7 |
| 20 | Beaconsfield High School | 84.6 compositeOfsted23.3 Att828.1 EM5+33.1 | Grammar · Day · 6th | Beaconsfield, South East | Outstanding 2019-12-11×0.7 |
| 21 | Hinchley Wood School | 84.3 compositeOfsted33.3 Att823.9 EM5+27.1 | Academy · Day · 6th | Esher, South East | Outstanding 2023-10-03 |
| 22 | St Andrew's Catholic School | 84.3 compositeOfsted33.3 Att824.1 EM5+26.8 | Academy · Day · 6th | Leatherhead, South East | Outstanding 2024-05-22 |
| 23 | Dr Challoner's Grammar School | 82.8 compositeOfsted23.3 Att827.4 EM5+32.1 | Grammar · Day · 6th | Amersham, South East | Outstanding 2019-11-05×0.7 |
| 24 | St Peter's Catholic School | 82.5 compositeOfsted33.3 Att823.6 EM5+25.6 | Academy · Day · 6th | Guildford, South East | Outstanding 2024-05-15 |
| 25 | Maidstone Grammar School for Girls | 82.2 compositeOfsted28.3 Att824.6 EM5+29.2 | Grammar · Day · 6th | Maidstone, South East | Outstanding 2023-03-07×0.85 |