| 1 | Reading School Period 202324 | 53.9 | Grammar · Boarding · 6th | Reading, South East | Outstanding |
| 2 | Trinity School Period 202122 | 52.6 | Free School · Day · 6th | Sevenoaks, South East | — |
| 3 | Dr Challoner's Grammar School Period 202122 | 51.0 | Grammar · Day · 6th | Amersham, South East | Outstanding |
| 4 | Barton Court Grammar School Period 202223 | 50.0 | Grammar · Day · 6th | Canterbury, South East | Good |
| 5 | Salesian School, Chertsey Period 202122 | 50.0 | Academy · Day · 6th | Chertsey, South East | — |
| 6 | Kendrick School Period 202122 | 49.8 | Grammar · Day · 6th | Reading, South East | Outstanding |
| 7 | Royal Latin School Period 202122 | 49.2 | Grammar · Day · 6th | Buckingham, South East | Good |
| 8 | St Andrew's Catholic School Period 202122 | 49.0 | Academy · Day · 6th | Leatherhead, South East | Outstanding |
| 9 | The Royal Grammar School, High Wycombe Period 202122 | 48.9 | Grammar · Boarding · 6th | High Wycombe, South East | Good |
| 10 | Tunbridge Wells Girls' Grammar School Period 202122 | 48.7 | Grammar · Day · 6th | Tunbridge Wells, South East | Outstanding |
| 11 | Langley Grammar School Period 202122 | 48.6 | Grammar · Day · 6th | Langley, South East | Outstanding |
| 12 | Dr Challoner's High School Period 202122 | 48.5 | Grammar · Day · 6th | Amersham, South East | Outstanding |
| 13 | Beaconsfield High School Period 202122 | 48.2 | Grammar · Day · 6th | Beaconsfield, South East | Outstanding |
| 14 | Chatham & Clarendon Grammar School Period 202425 | 48.1 | Grammar · Day · 6th | Ramsgate, South East | — |
| 15 | Sir William Borlase's Grammar School Period 202122 | 47.9 | Grammar · Day · 6th | Marlow, South East | Outstanding |
| 16 | The Skinners' School Period 202122 | 47.7 | Grammar · Day · 6th | Tunbridge Wells, South East | Good |
| 17 | The Judd School Period 202425 | 47.6 | Grammar · Day · 6th | Tonbridge, South East | — |
| 18 | Wycombe High School Period 202122 | 47.5 | Grammar · Day · 6th | High Wycombe, South East | Outstanding |
| 19 | Aylesbury High School Period 202122 | 47.3 | Grammar · Day · 6th | Aylesbury, South East | Outstanding |
| 20 | Dartford Grammar School Period 202122 | 46.4 | Grammar · Day · 6th | Dartford, South East | Outstanding |
| 21 | Chesham Grammar School Period 202425 | 46.3 | Grammar · Day · 6th | Chesham, South East | — |
| 22 | St John the Baptist Catholic Comprehensive School, Woking Period 202425 | 46.3 | Academy · Day · 6th | Woking, South East | — |
| 23 | Aylesbury Grammar School Period 202122 | 46.2 | Grammar · Day · 6th | Aylesbury, South East | Outstanding |
| 24 | Tonbridge Grammar School Period 202122 | 45.9 | Grammar · Day · 6th | Tonbridge, South East | Outstanding |
| 25 | Sir Joseph Williamson's Mathematical School Period 202122 | 45.7 | Grammar · Day · 6th | Rochester, South East | Outstanding |