| 1 | Queen Elizabeth's School, Barnet Period 202425 | 83.8% | Grammar · Day · 6th | Barnet, London | Outstanding |
| 2 | Wilson's School Period 202425 | 79.3% | Grammar · Day · 6th | Wallington, London | Outstanding |
| 3 | St Olave's and St Saviour's Grammar School Period 202425 | 78.5% | Grammar · Day · 6th | Orpington, London | — |
| 4 | Tiffin School Period 202425 | 66.7% | Grammar · Day · 6th | Kingston upon Thames, London | Good |
| 5 | Sutton Grammar School Period 202425 | 61.5% | Grammar · Day · 6th | Sutton, London | Good |
| 6 | Wallington County Grammar School Period 202425 | 55.6% | Grammar · Day · 6th | Wallington, London | — |
| 7 | Ilford County High School Period 202425 | 35.4% | Grammar · Day · 6th | Ilford, London | Good |
| 8 | Hasmonean High School for Boys Period 202425 | 34.0% | Academy · Day · 6th | London, London | Good |
| 9 | The Cardinal Vaughan Memorial RC School Period 202425 | 31.3% | Academy · Day · 6th | London, London | Outstanding |
| 10 | The St Thomas the Apostle College Period 202425 | 29.9% | State · Day · 6th | London, London | — |
| 11 | Rutlish School Period 202425 | 29.7% | State · Day · 6th | London, London | — |
| 12 | The London Oratory School Period 202425 | 29.0% | Academy · Day · 6th | London, London | Outstanding |
| 13 | Carshalton Boys Sports College Period 202425 | 26.8% | Academy · Day · 6th | Carshalton, London | Good |
| 14 | Wimbledon College Period 202425 | 26.6% | State · Day · 6th | London, London | — |
| 15 | Gunnersbury Catholic School Period 202425 | 24.6% | State · Day · 6th | Brentford, London | Outstanding |
| 16 | St Joseph's College Period 202425 | 23.8% | Academy · Day · 6th | London, London | Good |
| 17 | Norlington School and 6th Form Period 202425 | 21.7% | Academy · Day · 6th | London, London | — |
| 18 | Harris Boys' Academy East Dulwich Period 202425 | 21.1% | Academy · Day · 6th | London, London | Outstanding |
| 19 | Richard Challoner School Period 202425 | 14.7% | Academy · Day · 6th | New Malden, London | Outstanding |
| 20 | Beths Grammar School Period 202425 | 14.6% | Grammar · Day · 6th | Bexley, London | Good |
| 21 | Langley Park School for Boys Period 202425 | 14.1% | Academy · Day · 6th | Beckenham, London | — |
| 22 | The John Fisher School Period 202425 | 13.6% | State · Day · 6th | Purley, London | — |
| 23 | Central Foundation Boys' School Period 202425 | 13.6% | State · Day · 6th | London, London | — |
| 24 | Westminster City School Period 202425 | 13.5% | Academy · Day · 6th | London, London | — |
| 25 | Finchley Catholic High School Period 202425 | 13.2% | State · Day · 6th | London, London | — |