Agbajeola, R.O. et al. 2025. INFLUENCE OF TEACHERS’ PROFESSIONAL DEVELOPMENT ON STUDENTS’ ACADEMIC ACHIEVEMENT IN PUBLIC SENIOR SECONDARY SCHOOL MATHEMATICS IN THE GAMBIA. African Journal of Behavioural and Scale Development Research. 7, 1 (Dec. 2025). DOI:https://doi.org/10.58579/AJB-SDR/7.1.2025.10.