The Kenya High School emerged the best school in the KCSE 2021/2022 exams in the County with a mean score of 10.42 which is a B+ (plus).
2021/2022 BEST, TOP PERFORMING SCHOOLS IN NAIROBI COUNTY
| Pos Nationally | School Name | Mean Score | County | |
| 2 | The Kenya High School | 10.42 | B+ | Nairobi |
| 13 | Starehe Boys Centre | 9.44 | B | Nairobi |
| 30 | Nairobi School | 9 | B | Nairobi |
| 32 | Kianda School | 8.99 | B | Nairobi |
| 65 | Lenana School | 8.3719 | B- | Nairobi |
| 67 | Riara Springs | 8.32 | B- | Nairobi |