| 1 | Reading School Period 202425 | 62.9% | Grammar · Boarding · 6th | Reading, South East | Outstanding |
| 2 | The Judd School Period 202425 | 62.2% | Grammar · Day · 6th | Tonbridge, South East | — |
| 3 | Dr Challoner's Grammar School Period 202425 | 57.8% | Grammar · Day · 6th | Amersham, South East | Outstanding |
| 4 | Trinity School Period 202425 | 57.6% | Free School · Day · 6th | Sevenoaks, South East | — |
| 5 | Langley Grammar School Period 202425 | 54.1% | Grammar · Day · 6th | Langley, South East | Outstanding |
| 6 | Royal Latin School Period 202425 | 52.1% | Grammar · Day · 6th | Buckingham, South East | Good |
| 7 | Kendrick School Period 202425 | 51.4% | Grammar · Day · 6th | Reading, South East | Outstanding |
| 8 | The Royal Grammar School, High Wycombe Period 202425 | 47.7% | Grammar · Boarding · 6th | High Wycombe, South East | Good |
| 9 | Sir William Borlase's Grammar School Period 202425 | 44.4% | Grammar · Day · 6th | Marlow, South East | Outstanding |
| 10 | Chesham Grammar School Period 202425 | 43.3% | Grammar · Day · 6th | Chesham, South East | — |
| 11 | Upton Court Grammar School Period 202425 | 40.8% | Grammar · Day · 6th | Slough, South East | Outstanding |
| 12 | Dr Challoner's High School Period 202425 | 40.7% | Grammar · Day · 6th | Amersham, South East | Outstanding |
| 13 | The Regis School Period 202425 | 40.7% | Academy · Day · 6th | West Sussex, South East | — |
| 14 | Herschel Grammar School Period 202425 | 39.9% | Grammar · Day · 6th | Slough, South East | Outstanding |
| 15 | Altwood Church of England School Period 202425 | 38.5% | Academy · Day · 6th | Maidenhead, South East | — |
| 16 | Guildford County School Period 202425 | 37.4% | Academy · Day · 6th | Guildford, South East | — |
| 17 | Aylesbury Grammar School Period 202425 | 35.7% | Grammar · Day · 6th | Aylesbury, South East | Outstanding |
| 18 | St Andrew's Catholic School Period 202425 | 35.2% | Academy · Day · 6th | Leatherhead, South East | Outstanding |
| 19 | The Cherwell School Period 202425 | 34.3% | Academy · Day · 6th | Oxford, South East | Outstanding |
| 20 | Futures Institute Banbury Period 202425 | 33.3% | Free School · Day · 6th | Banbury, South East | — |
| 21 | Aylesbury High School Period 202425 | 33.3% | Grammar · Day · 6th | Aylesbury, South East | Outstanding |
| 22 | The Holt School Period 202425 | 33.1% | Academy · Day · 6th | Wokingham, South East | Outstanding |
| 23 | St Bernard's Catholic Grammar School Period 202425 | 32.3% | Grammar · Day · 6th | Slough, South East | Outstanding |
| 24 | John Hampden Grammar School Period 202425 | 31.4% | Grammar · Day · 6th | High Wycombe, South East | Outstanding |
| 25 | The Skinners' School Period 202425 | 31.0% | Grammar · Day · 6th | Tunbridge Wells, South East | Good |