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EFFECT OF KELLER SYSTEM OF INSTRUCTION ON FEMALE AND MALE STUDENTS’ ACADEMIC ACHIEVEMENT IN BIOLOGY IN ABAKALIKI EDUCATION ZONE, EBONYI STATE. JERCPT [Internet]. 2025 Jan. 1 [cited 2026 Nov. 8];6(1):13-29. Available from: https://ercptjournal.com/index.php/ojs/article/view/122