| 1 | Guildford High School Period 202425 | 78.9% | Independent · Day · 6th | Guildford, South East | — |
| 2 | Magdalen College School Period 202425 | 72.0% | Independent · Day · 6th | Oxford, South East | — |
| 3 | Royal Grammar School Guildford Period 202425 | 71.7% | Independent · Day · 6th | Unknown, South East | — |
| 4 | Brighton College Period 202425 | 70.5% | Independent · Boarding · 6th | Brighton, South East | — |
| 5 | Winchester College Period 202425 | 68.2% | Independent · Boarding · 6th | Winchester, South East | — |
| 6 | Sevenoaks School Period 202425 | 67.5% | Independent · Boarding · 6th | Sevenoaks, South East | — |
| 7 | Tonbridge School Period 202223 | 64.8% | Independent · Boarding · 6th | Tonbridge, South East | — |
| 8 | Eton College Period 202223 | 64.8% | Independent · Boarding · 6th | Windsor, South East | — |
| 9 | Oxford International College Period 202425 | 64.6% | Independent · Boarding · 6th | Unknown, South East | Inadequate |
| 10 | Wycombe Abbey Period 202425 | 63.9% | Independent · Boarding · 6th | High Wycombe, South East | — |
| 11 | Charterhouse Period 202425 | 61.2% | Independent · Boarding · 6th | Godalming, South East | — |
| 12 | City of London Freemen's School Period 202425 | 60.4% | Independent · Boarding · 6th | Surrey, South East | — |
| 13 | Abingdon School Period 202425 | 58.9% | Independent · Boarding · 6th | Abingdon, South East | — |
| 14 | The King's School Canterbury Period 202223 | 58.5% | Independent · Boarding · 6th | Canterbury, South East | — |
| 15 | St Swithuns Period 202425 | 58.3% | Independent · Boarding · 6th | Unknown, South East | — |
| 16 | Sir William Perkins's School Period 202425 | 58.1% | Independent · Day · 6th | Unknown, South East | — |
| 17 | St Helen and St Katharine Period 202425 | 57.6% | Independent · Day · 6th | Abingdon, South East | — |
| 18 | Reigate Grammar School Period 202425 | 57.3% | Independent · Day · 6th | Reigate, South East | — |
| 19 | Bedales School Period 202122 | 49.5% | Independent · Boarding · 6th | Petersfield, South East | — |
| 20 | Queen Anne's School Period 202425 | 49.5% | Independent · Boarding · 6th | Reading, South East | — |
| 21 | Heathfield School Period 202425 | 49.5% | Independent · Boarding · 6th | Ascot, South East | — |
| 22 | Stowe School Period 202425 | 49.5% | Independent · Boarding · 6th | Buckingham, South East | — |