In the 2020 Kenya Certificate of Secondary Education (KCSE) ranking of schools for Kiambu County, Mang’u High school emerged the overall top, best, school. The school managed to score an impressive mean score of 10.28.
See also; kcse 2020 list of top 100 schools
Alliance High School scooped the second position with a mean score of 10.18 while, St Francis Girls High School clinched third spot with a mean score of 8.29.
Get results and ranking for all schools here; KCSE results portal
Kiambu COUNTY TOP, BEST, SCHOOLS IN KCSE 2020 EXAMINATIONS
| School Name | Mean Score | County |
| Mang’u High | 10.28 | Kiambu |
| Alliance High | 10.18 | Kiambu |
| St Francis Girls | 8.29 | Kiambu |
KCSE 2020 BEST 100 SCHOOLS NATIONALLY
Check, the list below, to see how schools from this county ranked nationally in the KCSE 2020 examinations.
| Position | School Name | Mean Score | County |
| 1 | Kapsabet Boys | 10.51 | Nandi |
| 2 | Kenya High | 10.4 | Nairobi |
| 3 | Mang’u High | 10.28 | Kiambu |
| 4 | Alliance High | 10.18 | Kiambu |
| 5 | Light Academy | 10.05 | Nairobi |
| 6 | St Joseph Girls | 9.95 | TransNzoia |
| 7 | Murang’a High | 9.86 | Murang’a |
| 8 | St Bridgid | 9.85 | Transnzoia |
| 9 | Pangani Gilrs | 9.84 | Nairobi |
| 10 | Maranda High | 9.8 | Siaya |
| 11 | Strathmore School | 9.78 | Nairobi |
| 12 | MoiGirls Eldoret | 9.68 | UasinGishu |
| 13 | Friends school | 9.62 | Bungoma |
| 14 | Asumbi Girls | 9.6 | HomaBay |
| 15 | Moi Kabarak | 9.56 | Nakuru |
| 16 | Anestar Boys | 9.58 | Nakuru |
| 17 | Chemilil Academy | 9.55 | Kisumu |
| 18 | Kisima Sec | 9.5 | Nyandarua |
| 19 | Maseno School | 9.5 | Kisumu |
| 20 | Baricho High | 9.48 | Kirinyaga |
| 21 | Starehe Boys. | 9.43 | Nairobi |
| 22 | Kagumo High | 9.41 | Nyeri |
| 23 | Nairobi School | 9.41 | Nairobi |
| 24 | Moi Tea Girls | 9.3 | Kericho |
| 25 | Riokindo Boys | 9.3 | Kisii |
| 26 | Kiage Tumaini | 9.3 | Kisii |
| 27 | Lugulu Girls | 9.3 | Bungoma |
| 28 | Bishop Gatimu | 9.23 | Nyeri |
| 29 | Chepterit Girls | 9.2 | Nandi |
| 30 | Agoro Sare | 9.2 | HomaBay |
| 31 | Orero Boys | 9.2 | Homa Bay |
| 32 | Sheikh Khalifa | 9.1 | Mombasa |
| 33 | Kisii School | 9.1 | Kisii |
| 34 | Kanga High | 9.05 | Migori |
| 35 | Meru School | 9.03 | Meru |
| 36 | Lenana School | 8.92 | Nairobi |
| 37 | Kapsabet Girls | 8.92 | Nandi |
| 38 | Mary Mother | 8.9 | Laikipia |
| 39 | Kipsigis Girls | 8.9 | Kericho |
| 40 | Kabianga School | 8.9 | Kericho |
| 41 | Mbita High | 8.9 | Homa Bay |
| 42 | Butere Girls | 8.9 | Kakamega |
| 43 | Njiiri School | 8.87 | Muranga |
| 44 | Meteitei Secondary | 8.82 | Nandi |
| 45 | Bunyore Girls | 8.81 | Vihiga |
| 46 | Nakuru Boys | 8.8 | Nakuru |
| 47 | Litein High | 8.8 | Kericho |
| 48 | Kebirigo Boys | 8.8 | Nyamira |
| 49 | St Mary’s Igoji | 8.8 | Meru |
| 50 | Chogoria Girls | 8.8 | T.Nithi |
| 51 | Makueni Boys. | 8.75 | Makueni |
| 52 | Mbooni Girls | 8.74 | Makueni |
| 53 | St Anthony Boy | 8.73 | T Nzoia |
| 54 | Light Academy | 8.72 | Mombasa |
| 55 | Moi Naikarra | 8.7 | Narok |
| 56 | Nyambaria Boys | 8.7 | Nyamira |
| 57 | Oriwo Boys | 8.7 | Homa Bay |
| 58 | Segero Academy | 8.7 | U. Gishu |
| 59 | St Patrick Iten | 8.69 | E.Marakwet |
| 60 | Baringo High | 8.65 | Baringo |
| 61 | Nanyuki High | 8.63 | Laikipia |
| 62 | Machakos School | 8.62 | Machakos |
| 63 | Moi Girls | 8.6 | Nairobi |
| 64 | St Joseph Kitale | 8.6 | T.Nzoia |
| 65 | St Mary’s Kibabii | 8.57 | Bungoma |
| 66 | Chavakali High | 8.56 | vihiga |
| 67 | Mahiga Girls | 8.55 | Nyeri |
| 68 | Anin Girls | 8.5 | E.Marakwet |
| 69 | Ulanda Girls | 8.5 | Migori |
| 70 | Carmel Girls | 8.5 | Machakos |
| 71 | Nkubu High | 8.5 | Meru |
| 72 | Moi High Mbituri | 8.5 | Embu |
| 73 | Kakamega High sch | 8.48 | kakamega |
| 74 | Kisau Girls | 8.42 | Makueni |
| 75 | Ogande Girls | 8.4 | Homa Bay |
| 76 | Kaaga Girls | 8.4 | Meru |
| 77 | St Francis Rangala | 8.38 | Siaya |
| 78 | Edinburg School | 8.38 | Muranga |
| 79 | Nyangwa Boys | 8.34 | Embu |
| 80 | Kahuhia Girls | 8.33 | Muranga |
| 81 | Kyeni Girls | 8.32 | Embu |
| 82 | Sacho High School | 8.3 | Baringo |
| 83 | Moi Siongoroi | 8.3 | Bomet |
| 84 | Metkei Girls | 8.3 | E. Marakwet |
| 85 | St Francis Girls | 8.29 | Kiambu |
| 86 | Pioneer School | 8.25 | Muranga |
| 87 | Tengecha Girls | 8.2 | Kericho |
| 88 | Karima Girls | 8.2 | Nyandarua |
| 89 | Kabarnet Boys | 8.2 | Baringo |
| 90 | Chepkumia Secondary | 8.2 | Nandi |
| 91 | Memon Academy | 8.2 | Mombasa |
| 92 | Nyamira Girls | 8.2 | Siaya |
| 93 | Sironga Girls | 8.2 | Nyamira |
| 94 | St Joseph Rapogi | 8.2 | Migori |
| 95 | Ikuu Boys | 8.2 | T. Nithi |
| 96 | Tenwek High | 8.19 | Bomet |
| 97 | Butula Boys | 8.15 | Busia |
| 98 | Booker Academy | 8.14 | Kakamega |
| 99 | Nyeri High | 8.13 | Nyeri |
| 100 | Tengecha Boys | 8.1 | Kericho |
| 101 | AIC Litein Girls | 8.1 | Kericho |
