Nneka , Nnorom R., and Juliana C. Uchegbu. “ Effect of Mastery Learning Approach on Senior Secondary School Students Achievement in Biology in Imo ”. African Journal of Education,Science and Technology (AJEST) 3, no. 3 (May 8, 2017): pp 100–105. Accessed April 3, 2026. http://ajest.org/index.php/ajest/article/view/571.