Sulaiman, Hamza Alhaji, and Aminu Hussaini. 2023. “Items Analysis of Mathematics Basic Education Certificate Examination in Junior Secondary Schools Before and After Covid-19 Lockdown in Sokoto State”. African Journal of Humanities and Contemporary Education Research 11 (1):243-57. https://publications.afropolitanjournals.com/index.php/ajhcer/article/view/474.