Alliance High School emerged top in the 2019 Kenya Certificate of Secondary Education, KCSE, examination in Kiambu County. The school had a mean score of 10.019 (B+ plus) to take position 4 nationally.
The second and third positions were scooped by Mary Hill Girls and Mang’u High school; respectively.
Here is a list of the KCSE 2019 best 10 schools in Kiambu County:
| Pos in County | School | KCSE 2019 Mean | County | Pos Nationally |
| 1 | Alliance High | 10.019 | Kiambu | 4 |
| 2 | Mary Hill Girls | 9.92 | Kiambu | 5 |
| 3 | Mang’u High | 9.868 | Kiambu | 9 |
| 4 | Damacrest Academy | 8.8 | Kiambu | 34 |
| 5 | Limuru Girls | 8.7 | Kiambu | 37 |
| 6 | Thika High | 7.74 | Kiambu | 100 |
| 7 | Mary Leakey Girls | 7.1 | Kiambu | 161 |
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