IDRIS MK, JADA HM, GARBA U. SCHOOL INSTRUCTIONAL SUPERVISION AND DISPARITIES IN THE ACHIEVEMENT OF EFFECTIVE TEACHING AND LEARNING IN NIGERIAN POST - BASIC SECONDARY SCHOOLS. sokedureview [Internet]. 2025Sep.30 [cited 2025Oct.14];24(2):104-11. Available from: http://www.sokedureview.org/index.php/SER/article/view/570