1 Euro Afro Studies International Journal ® (EASIJ.COM) Email: editor.easij@gmail.com editor@easij.com Website: easij.com Published By An Analysis of Students’ Academic Performance in School – Based Assessment and Certificate Examinations in General Mathematics, Physics and Computer Science in Ondo state, Nigeria Author(s), OLOJO, Jethro Oludare (Ph.D) Abstract: In education, the phrase assessment refers to the wide range of methods and tools that educators use to assess, measure, and document students' academic readiness, learning progress, skill development, and educational needs. There are mainly two methods of assessment in Nigerian schools; viz: School-Based Assessment (SBA) and external examinations. The purpose of this research is to see if SBA has an impact on the final examination grades in secondary schools Mathematics, Computer Science and Physics in Ondo State, Nigeria. The researchers employed an ex-post-facto study design to accomplish this. This study used the results of students who took the West African Senior School Certificate Examinations (WASSCE) in the 2019/2020 academic year. As a result, the study's population comprised all 2,674 Senior Secondary School students who graduated from all the public senior secondary schools in Akoko South West Local Government Area of Ondo State during the 2019/2020 academic year. The instrument for data collection was the profoma tagged “Instrument of Comparative Performance in School – Based Assessment and External Examination (ICSPSBAEE)”. The study's sample comprised 150 students who were chosen at random and in clusters for the study. EASIJ Accepted 4 August 2022 Published 27 August 2022 DOI: 10.5281/zenodo.7029437 Volume: 4, Issue:8 (Special Issue) Page: 32 - 48 AUGUST 2022 ISSN: 2707-8965 (Online) & 2708-3772 (Print) Euro Afro Studies International Journal® (EASIJ.COM) SPECIAL ISSUE – AUGUST 2022