| 1 | Reading School Period 202425 | 100.0% | Grammar · Boarding · 6th | Reading, South East | Outstanding |
| 2 | Dartford Grammar School Period 202425 | 98.9% | Grammar · Day · 6th | Dartford, South East | Outstanding |
| 3 | The Judd School Period 202425 | 98.4% | Grammar · Day · 6th | Tonbridge, South East | — |
| 4 | John Hampden Grammar School Period 202425 | 97.8% | Grammar · Day · 6th | High Wycombe, South East | Outstanding |
| 5 | The Royal Grammar School, High Wycombe Period 202425 | 97.6% | Grammar · Boarding · 6th | High Wycombe, South East | Good |
| 6 | Dr Challoner's Grammar School Period 202425 | 96.2% | Grammar · Day · 6th | Amersham, South East | Outstanding |
| 7 | Aylesbury Grammar School Period 202425 | 95.2% | Grammar · Day · 6th | Aylesbury, South East | Outstanding |
| 8 | Sir Joseph Williamson's Mathematical School Period 202425 | 93.5% | Grammar · Day · 6th | Rochester, South East | Outstanding |
| 9 | The Skinners' School Period 202425 | 93.4% | Grammar · Day · 6th | Tunbridge Wells, South East | Good |
| 10 | Dover Grammar School for Boys Period 202425 | 93.0% | Grammar · Day · 6th | Dover, South East | — |
| 11 | Oakwood Park Grammar School Period 202425 | 93.0% | Grammar · Day · 6th | Maidstone, South East | — |
| 12 | Maidstone Grammar School Period 202425 | 92.0% | Grammar · Day · 6th | Maidstone, South East | — |
| 13 | Gravesend Grammar School Period 202425 | 91.9% | Grammar · Day · 6th | Gravesend, South East | — |
| 14 | Tunbridge Wells Grammar School for Boys Period 202425 | 91.2% | Grammar · Day · 6th | Tunbridge Wells, South East | — |
| 15 | The Norton Knatchbull School Period 202425 | 90.9% | Grammar · Day · 6th | Ashford, South East | Good |
| 16 | Wilmington Grammar School for Boys Period 202425 | 90.0% | Grammar · Day · 6th | Dartford, South East | — |
| 17 | Simon Langton Grammar School for Boys Period 202425 | 88.9% | Grammar · Day · 6th | Canterbury, South East | — |
| 18 | The Harvey Grammar School Period 202425 | 85.5% | Grammar · Day · 6th | Folkestone, South East | — |
| 19 | Holcombe Grammar School Period 202425 | 84.7% | Grammar · Day · 6th | Chatham, South East | — |
| 20 | Borden Grammar School Period 202425 | 83.1% | Grammar · Day · 6th | Sittingbourne, South East | — |
| 21 | Glyn School Period 202425 | 66.5% | Academy · Day · 6th | Epsom, South East | Outstanding |
| 22 | The Forest School Period 202425 | 59.5% | Academy · Day · 6th | Wokingham, South East | Good |
| 23 | Desborough College Period 202425 | 53.5% | Academy · Day · 6th | Maidenhead, South East | — |
| 24 | The Windsor Boys' School Period 202425 | 52.6% | Academy · Day · 6th | Windsor, South East | — |
| 25 | St Birinus School Period 202425 | 50.9% | Academy · Day · 6th | Didcot, South East | — |