| 1 | Upton Court Grammar School Period 202425 | 99.4% | Grammar · Day · 6th | Slough, South East | Outstanding |
| 2 | Herschel Grammar School Period 202425 | 98.7% | Grammar · Day · 6th | Slough, South East | Outstanding |
| 3 | Langley Grammar School Period 202425 | 98.3% | Grammar · Day · 6th | Langley, South East | Outstanding |
| 4 | St Bernard's Catholic Grammar School Period 202425 | 98.1% | Grammar · Day · 6th | Slough, South East | Outstanding |
| 5 | Sir Henry Floyd Grammar School Period 202425 | 97.2% | Grammar · Day · 6th | Aylesbury, South East | Outstanding |
| 6 | Chesham Grammar School Period 202425 | 96.7% | Grammar · Day · 6th | Chesham, South East | — |
| 7 | Sir William Borlase's Grammar School Period 202425 | 96.7% | Grammar · Day · 6th | Marlow, South East | Outstanding |
| 8 | Royal Latin School Period 202425 | 94.8% | Grammar · Day · 6th | Buckingham, South East | Good |
| 9 | Burnham Grammar School Period 202425 | 94.4% | Grammar · Day · 6th | Slough, South East | — |
| 10 | Dane Court Grammar School Period 202425 | 92.8% | Grammar · Day · 6th | Broadstairs, South East | Good |
| 11 | Rainham Mark Grammar School Period 202425 | 87.3% | Grammar · Day · 6th | Gillingham, South East | Good |
| 12 | Queen Elizabeth's Grammar School Period 202425 | 87.2% | Grammar · Day · 6th | Faversham, South East | Good |
| 13 | Cranbrook School Period 202425 | 86.3% | Grammar · Boarding · 6th | Cranbrook, South East | Good |
| 14 | Chatham & Clarendon Grammar School Period 202425 | 84.9% | Grammar · Day · 6th | Ramsgate, South East | — |
| 15 | Barton Court Grammar School Period 202425 | 84.9% | Grammar · Day · 6th | Canterbury, South East | Good |
| 16 | Salesian School, Chertsey Period 202425 | 82.6% | Academy · Day · 6th | Chertsey, South East | — |
| 17 | Hinchley Wood School Period 202425 | 81.2% | Academy · Day · 6th | Esher, South East | Outstanding |
| 18 | Sir Roger Manwood's School Period 202425 | 81.0% | Grammar · Day · 6th | Sandwich, South East | Good |
| 19 | St Andrew's Catholic School Period 202425 | 80.4% | Academy · Day · 6th | Leatherhead, South East | Outstanding |
| 20 | Weydon School Period 202425 | 79.7% | Academy · Day | Farnham, South East | Good |
| 21 | Heathside School Period 202425 | 77.1% | Academy · Day · 6th | Weybridge, South East | — |
| 22 | St Peter's Catholic School Period 202425 | 76.9% | Academy · Day · 6th | Guildford, South East | Outstanding |
| 23 | Gordon's School Period 202425 | 76.4% | Academy · Boarding · 6th | Woking, South East | — |
| 24 | Gillotts School Period 202425 | 76.0% | Academy · Day | Henley-on-Thames, South East | Outstanding |
| 25 | St Paul's Catholic College Period 202425 | 75.1% | Academy · Day · 6th | Sunbury-on-Thames, South East | — |