Bello Kaseem S. DIFFERENTIAL ITEM FUNCTIONING ANALYSIS OF 2022 AND 2023 ALGEBRA AND ELEMENTARY TRIGONOMETRY EXAMINATIONS AT FEDERAL POLYTECHNIC DAURA, KATSINA STATE, NIGERIA. GUJED [Internet]. 2025 Dec. 8 [cited 2026 Apr. 16];3(2):36-42. Available from: https://gujed.com.ng/index.php/gujed/article/view/93