Isah Suleiman A, Adeyanju Hammed I., Adeniran Semiu Adewale and Aliyu Hadiza Abubakar 2021. CLOSING THE ACHIEVEMENT GAP: EXPLORING BLOOM’S MASTERY LEARNING MODEL IN TEACHING GENETICS CONCEPTS IN SECONDARY SCHOOLS IN KATSINA STATE . African Journal of Educational Management. 21, 1 (Jul. 2021), 191 –.