In Kenya, extra county schools fall in the second tier after national schools. In recent years, cases have emerged where extra county schools perform better than national school. Extra county secondary schools in Nandi county are grouped into three clusters; cluster one(C1), cluster two(C2) and cluster three (C3). Onjiko High School, Nyakach Girls’ High School, Kisumu Boys High School among other schools form cluster one schools in Kisii County.
| S/N | SCHOOL CODE | SCHOOL NAME | TYPE | CLUSTER |
| 1. | 39713006 | Onjiko High School | Boys | C1 |
| 2. | 39733212 | Nyabondo High School | Boys | C1 |
| 3. | 39733213 | Nyakach Girls’ High School | Girls | C1 |
| 4. | 39733216 | Sigoti Complex Girls Secondary School | Girls | C1 |
| 5. | 39733307 | Thurdibuoro Mixed Secondary School | Mixed | C1 |
| 6. | 39734401 | Achego Girls Secondary School | Girls | C1 |
| 7. | 39734402 | Koru Girls Secondary School | Girls | C1 |
| 8. | 39737022 | Chulaimbo Secondary School | Boys | C1 |
| 9. | 39741005 | Kisumu Boys High School | Boys | C1 |
| 10. | 39713001 | Ahero Girls Secondary School | Girls | C2 |
| 11. | 39713021 | Otieno Oyoo Secondary School | Boys | C2 |
| 12. | 39714101 | Ngere High School | Boys | C2 |
| 13. | 39714106 | St. Barnabas Girls’ Secondary School | Girls | C2 |
| 14. | 39733108 | Ack Rae Girls High School | Girls | C2 |
| 15. | 39737025 | Sinyolo Girls Secondary School | Girls | C2 |
| 16. | 39713023 | Migingo Girls Secondary School | Girls | C3 |
| 17. | 39734312 | Miwani Secondary School | Boys | C3 |
| 18. | 39734408 | St. Stephen’s Menara Secondary School | Boys | C3 |
| 19. | 39741007 | St.Teresa’s Girls Secondary School | Girls | C3 |
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List of best performing Extra County schools in Siaya County
List of best performing Extra County Secondary schools in Homa Bay County
List of best performing Extra County Secondary schools in Kisii County
List of best performing Extra County Secondary schools in Kisumu County
List of best performing Extra County schools in Kericho County
List of best performing Extra County schools in Nakuru County
List of best performing Extra County schools in Uasin Gishu County
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List of best performing Extra County schools in Nairobi County
List of best performing Extra County Secondary Schools in Nyeri County
List of best performing Extra County Schools in Murang’a County and their Codes