KCSE 2022-2023 Eastern Region Ranking of Best, Top 100 Schools (Ultimate List)
| Position Nationally | Name of School | Region | County | Mean Score | Mean Grade |
| 22 | KAAGA GIRLS | Eastern | meru | 9.96 | B+{plus} |
| 24 | Matinyani Secondary | Eastern | Kitui | 9.942 | B+{plus} |
| 39 | MERU SCHOOL | Eastern | Meru | 9.52 | B+{plus} |
| 48 | Kitui School | Eastern | Kitui | 9.312 | B{plain} |
| 56 | Mt Carmel girls | Eastern | Makueni | 9.2353 | B{plain} |
| 65 | KATHIANI GIRLS HIGH | Eastern | Machakos | 9.1235 | B{plain} |
| 81 | Mbooni Girls | Eastern | Makueni | 8.911 | B{plain} |
| 108 | AIC Sombe Girls | Eastern | Kitui | 8.545 | B{plain} |
| 109 | IGEMBE BOYS | Eastern | Meru | 8.52 | B{plain} |
| 118 | MAKUENI BOYS | Eastern | Makueni | 8.399 | B-{minus) |
| 140 | ST CHARLES LWANGA SCHOOL KITUI | Eastern | Kitui | 8.18 | B-{minus) |
| 141 | St. Charles Lwanga | Eastern | Kitui | 8.18 | B-{minus) |
| 144 | Nkubu High | Eastern | Meru | 8.1693 | B-{minus) |
| 147 | MUTHALE GIRLS HIGH | Eastern | kitui | 8.11 | B-{minus) |
| 148 | Miathene Boys | Eastern | Meru | 8.101 | B-{minus) |
| 157 | MACHAKOS BOYS | Eastern | Machakos | 8.0081 | B-{minus) |
| 161 | KISASI SECONDARY | Eastern | kitui | 7.965 | B-{minus) |
| 165 | Precious Blood Kilungu | Eastern | Makueni | 7.92 | B-{minus) |
| 167 | KYANG’ONDU SECONDARY | Eastern | Makueni | 7.905 | B-{minus) |
| 184 | CARING HEARTS HIGH SCHOOL | Eastern | Machakos | 7.76 | B-{minus) |
| 198 | St. Josephs Kibwezi | Eastern | Makueni | 7.488 | C+{plus} |
| 201 | MISYANI GIRLS HIGH | Eastern | Machakos | 7.4823 | C+{plus} |
| 223 | Mwaani Girls | Eastern | Makueni | 7.209 | C+{plus} |
| 230 | Kaaga Boys | Eastern | Meru | 7.1837 | C+{plus} |
| 231 | Kavingoni Secondary | Eastern | Makueni | 7.181 | C+{plus} |
| 232 | Kisau Girls | Eastern | Makueni | 7.165 | C+{plus} |
| 233 | Machakos Girls | Eastern | Machakos | 7.1406 | C+{plus} |
| 237 | Makueni Girls | Eastern | Makueni | 7.102 | C+{plus} |
| 241 | Kaumoni Boys | Eastern | Makueni | 7.065 | C+{plus} |
| 244 | THE KITONDO SCHOOL | Eastern | Makueni | 7.04 | C+{plus} |
| 245 | Kitondo school | Eastern | Makueni | 7.04 | C+{plus} |
| 250 | Gikurune Boys | Eastern | Meru | 6.987 | C+{plus} |
| 251 | Kabaa High | Eastern | Machakos | 6.98 | C+{plus} |
| 252 | Maua Girls High | Eastern | Meru | 6.96 | C+{plus} |
| 254 | ST ANGELAS GIRLS SECONDARY | Eastern | Kitui | 6.935 | C+{plus} |
| 260 | MBOONI BOYS HIGH | Eastern | Makueni | 6.5 | C+{plus} |
| 261 | KATHEKA BOYS SECONDARY | Eastern | Kitui | 6.4818 | FALSE |
| 263 | MASINGA BOYS HIGH | Eastern | Machakos | 6.455 | C (plain) |
| 266 | Burieruri Secondary | Eastern | Meru | 6.36 | C (plain) |
| 289 | Ngoto Secondary | Eastern | Makueni | 5.8 | C (plain) |
| 294 | St Peters Voo Secondary | Eastern | Kitui | 5.667 | C (plain) |
| 298 | Mulala Girls | Eastern | Makueni | 5.6 | C (plain) |