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Extra county secondary schools in Nandi county are grouped into three clusters; cluster one(C1), cluster two(C2) and cluster three (C3). Kereri Girls High School, Riokindo High School, Moi Gesusu High School among other schools form cluster one schools in Kisii County.
Here is a list of best performing Extra County Secondary schools in Kisii County
| S/N | SCHOOL CODE | SCHOOL NAME | TYPE | CLUSTER |
| 1. | 40703103 | Kereri Girls High School | Girls | C1 |
| 2. | 40716103 | St.Paul’s Igonga Secondary School | Boys | C1 |
| 3. | 40719104 | Kiabigoria Secondary School | Mixed | C1 |
| 4. | 40727101 | Riokindo High School | Boys | C1 |
| 5. | 40735101 | Moi Gesusu High School | Boys | C1 |
| 6. | 40735201 | St. Charles Lwanga Ichuni Girls High School | Girls | C1 |
| 7. | 40745101 | Cardinal Otunga High School-Mosocho | Boys | C1 |
| 8. | 40703102 | Nyanchwa Boys High School | Boys | C2 |
| 9. | 40703403 | Nyamagwa Sda Secondary School | Mixed | C2 |
| 10. | 40711101 | St.Angela Sengera Girls Secondary School | Girls | C2 |
| 11. | 40716101 | E L C K Itierio Boys High School | Boys | C2 |
| 12. | 40716102 | Suneka Secondary School | Girls | C2 |
| 13. | 40716118 | E L C K Itierio Girls Secondary School | Girls | C2 |
| 14. | 40719102 | Riosiri Secondary School | Mixed | C2 |
| 15. | 40719301 | Tabaka Secondary School | Boys | C2 |
| 16. | 40723201 | Itibo Boys High School | Boys | C2 |
| 17. | 40723203 | Itibo Girls Secondary School | Girls | C2 |
| 18. | 40732206 | St. Theresa’s Nyangusu Girls Secondary School | Girls | C2 |
| 19. | 40740101 | St.Johns Nyamagwa Boys | Boys | C2 |
| 20. | 40740102 | Sameta High School | Boys | C2 |
| 21. | 40740104 | St. Mary’s Nyamagwa Girls Secondary School | Girls | C2 |
| 22. | 40716119 | Nyangoge Girls Secondaryschool | Girls | C3 |
| 23. | 40716122 | Bishop Charles Mugendi Secondary School | Mixed | C3 |
| 24. | 40719101 | Nduru Boys High School | Boys | C3 |
| 25. | 40732114 | Nyamache Secondary School | Boys | C3 |
Related posts;
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
List of best performing Extra County schools in Trans Nzoia County
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