Strathmore school (private) topped nationally in KCSE 2018 by flooring all giant schools. A total of 84 candidates sat for KCSE in Strathmore school making the school to register a performance index of 72.28.
Moi High school Kabarak also private school took position two nationally. With a total candidates of 330, the school had a performance index of 72.12.
On the other hand Moi Tea Girls an extra county school in Kericho county turned tides and took position one in public schools. The school had a total of 136 candidates and recorded a performance index of 69.59.
Alliance Girls of National school in Nairobi county also performed excellently. Of the 399 candidates who sat the examination at the school, some 35 candidates managed a straight A.
Here is a list of best schools nationally KCSE 2018
| School | Category | County |
| · Strathmore | Private | Nairobi |
| · Moi High Schl Kabarak | Private | Nakuru |
| · Moi Tea Girls | Extra County | Kericho |
| · Alliance Girls | National | Kiambu |
| · Alliance High | National | Kiambu |
| · Mang’u High | National | Kiambu |
| · Kisima Mixed Sec. | Private | Nyandarua |
| · Precious Blood Riruta | Extra County | Nairobi |
| · Orero Boys Sec. | Extra County | Homa Bay |
| · The Kenya High | National | Nairobi |
| · Moi Girls, Eldoret | National | Uasin Gishu |
| · Kianda School | Private | Nairobi |
| · Segero Adventist | Private | Uasin Gishu |
| · Anestar Boys, Lanet | Private | Nakuru |
| · Kapsabet Boys | National | Nandi |
| · Starehe Girls’ | National | Nairobi |
| · Maryhill Girls’ | National | Kiambu |
| · Pangani Girls’ | National | Nairobi |
| · Light Academy, Nairobi | Private | Nairobi |
| · Sheikh Khalifa Bin Zayed-Nahyan | Private | Mombasa |
| · Starehe Boys’ Centre | Private | Nairobi |
| · Loreto High, Limuru | Private | Kiambu |
| · Mary Mother of Grace Sec. Schl. | National | Laikipia |
| · Maseno School | National | Kisumu |
| · Agoro Sare High | Extra County | Homa Bay |
| · Sunshine Secondary | Private | Nairobi |
| · Kyeni Girls High | Extra County | Embu |
| · Mutira Girls’ Sec. | Extra County | Kirinyaga |
| · St. Theresa’s Girls Sec. | Private | Samburu |
| · Maranda High | National | Siaya |
| · Murang’a High | National | Muranga |
| · Riara Springs Academy | Private | Nairobi |
| · Light Academy, Mombasa | Private | Mombasa |
| · Pioneer School | Private | Muranga |
| · Metkei Sec. Schl | Extra County | Elgeyo Marakwet |