| 1 | Reading School Period 202324 | 53.9 | Grammar · Boarding · 6th | Reading, South East | Outstanding |
| 2 | Dr Challoner's Grammar School Period 202122 | 51.0 | Grammar · Day · 6th | Amersham, South East | Outstanding |
| 3 | The Royal Grammar School, High Wycombe Period 202122 | 48.9 | Grammar · Boarding · 6th | High Wycombe, South East | Good |
| 4 | The Skinners' School Period 202122 | 47.7 | Grammar · Day · 6th | Tunbridge Wells, South East | Good |
| 5 | The Judd School Period 202425 | 47.6 | Grammar · Day · 6th | Tonbridge, South East | — |
| 6 | Dartford Grammar School Period 202122 | 46.4 | Grammar · Day · 6th | Dartford, South East | Outstanding |
| 7 | Aylesbury Grammar School Period 202122 | 46.2 | Grammar · Day · 6th | Aylesbury, South East | Outstanding |
| 8 | Sir Joseph Williamson's Mathematical School Period 202122 | 45.7 | Grammar · Day · 6th | Rochester, South East | Outstanding |
| 9 | John Hampden Grammar School Period 202425 | 45.5 | Grammar · Day · 6th | High Wycombe, South East | Outstanding |
| 10 | Tunbridge Wells Grammar School for Boys Period 202122 | 43.3 | Grammar · Day · 6th | Tunbridge Wells, South East | — |
| 11 | Dover Grammar School for Boys Period 202122 | 42.5 | Grammar · Day · 6th | Dover, South East | — |
| 12 | Maidstone Grammar School Period 202122 | 41.1 | Grammar · Day · 6th | Maidstone, South East | — |
| 13 | Leigh Academy Tonbridge Period 202223 | 40.9 | Academy · Day · 6th | Tonbridge, South East | Good |
| 14 | Wilmington Grammar School for Boys Period 202324 | 40.7 | Grammar · Day · 6th | Dartford, South East | — |
| 15 | Oakwood Park Grammar School Period 202122 | 40.5 | Grammar · Day · 6th | Maidstone, South East | — |
| 16 | The Harvey Grammar School Period 202122 | 40.2 | Grammar · Day · 6th | Folkestone, South East | — |
| 17 | Gravesend Grammar School Period 202122 | 39.6 | Grammar · Day · 6th | Gravesend, South East | — |
| 18 | The Norton Knatchbull School Period 202122 | 39.2 | Grammar · Day · 6th | Ashford, South East | Good |
| 19 | Simon Langton Grammar School for Boys Period 202425 | 39.0 | Grammar · Day · 6th | Canterbury, South East | — |
| 20 | The Windsor Boys' School Period 202122 | 38.5 | Academy · Day · 6th | Windsor, South East | — |
| 21 | St Birinus School Period 202122 | 38.3 | Academy · Day · 6th | Didcot, South East | — |
| 22 | Borden Grammar School Period 202425 | 38.3 | Grammar · Day · 6th | Sittingbourne, South East | — |
| 23 | The Howard School Period 202324 | 37.7 | Academy · Day · 6th | Gillingham, South East | — |
| 24 | Holcombe Grammar School Period 202122 | 36.8 | Grammar · Day · 6th | Chatham, South East | — |
| 25 | Glyn School Period 202122 | 36.7 | Academy · Day · 6th | Epsom, South East | Outstanding |