| 1 | Brighton College Period 202122 | 55.0 | Independent · Boarding · 6th | Brighton, South East | — |
| 2 | Oxford International College Period 202122 | 52.9 | Independent · Boarding · 6th | Unknown, South East | Inadequate |
| 3 | Wellington College Period 202122 | 51.7 | Independent · Boarding · 6th | Unknown, South East | — |
| 4 | Reigate Grammar School Period 202122 | 51.5 | Independent · Day · 6th | Reigate, South East | — |
| 5 | Sevenoaks School Period 202122 | 51.1 | Independent · Boarding · 6th | Sevenoaks, South East | — |
| 6 | Hurstpierpoint College Period 202122 | 50.7 | Independent · Boarding · 6th | Hassocks, South East | — |
| 7 | City of London Freemen's School Period 202122 | 50.5 | Independent · Boarding · 6th | Surrey, South East | — |
| 8 | Churcher's College Period 202122 | 50.4 | Independent · Day · 6th | Petersfield, South East | — |
| 9 | Ardingly College Period 202122 | 49.3 | Independent · Boarding · 6th | Haywards Heath, South East | — |
| 10 | Caterham School Period 202122 | 49.3 | Independent · Boarding · 6th | Caterham, South East | — |
| 11 | Hurtwood House School Period 202122 | 48.7 | Independent · Boarding · 6th | Dorking, South East | — |
| 12 | The Portsmouth Grammar School Period 202122 | 48.0 | Independent · Day · 6th | Portsmouth, South East | — |
| 13 | d'Overbroeck's Period 202122 | 47.9 | Independent · Boarding · 6th | Oxford, South East | — |
| 14 | St George's College Weybridge Period 202122 | 47.5 | Independent · Day · 6th | Addlestone, South East | — |
| 15 | Epsom College Period 202122 | 47.2 | Independent · Boarding · 6th | Epsom, South East | — |
| 16 | Charterhouse Period 202122 | 47.1 | Independent · Boarding · 6th | Godalming, South East | — |
| 17 | Lingfield College Period 202122 | 46.5 | Independent · Day · 6th | Lingfield, South East | — |
| 18 | Claremont Fan Court School Period 202122 | 46.4 | Independent · Day · 6th | Unknown, South East | — |
| 19 | Cranleigh School Period 202122 | 45.9 | Independent · Boarding · 6th | Cranleigh, South East | — |
| 20 | The King's School Canterbury Period 202122 | 45.9 | Independent · Boarding · 6th | Canterbury, South East | — |
| 21 | Ewell Castle School Period 202223 | 45.8 | Independent · Day · 6th | Epsom, South East | — |
| 22 | The Yehudi Menuhin School Period 202223 | 45.7 | Independent · Boarding · 6th | Cobham, South East | — |
| 23 | Bradfield College Period 202122 | 45.5 | Independent · Boarding · 6th | Bradfield, South East | — |
| 24 | Sherfield School Period 202223 | 45.0 | Independent · Boarding · 6th | Hampshire, South East | — |
| 25 | Eastbourne College Period 202122 | 44.7 | Independent · Boarding · 6th | Eastbourne, South East | — |