Okafor AM, Okoli JN. EFFECT OF FLIPPED CLASSROOM INSTRUCTIONAL STRATEGY ON STUDENTS’ ACADEMIC ACHIEVEMENT AND INTEREST IN BIOLOGY IN SECONDARY SCHOOLS IN NNEWI EDUCATION ZONE. IJPAER [Internet]. 2026 Jul. 31 [cited 2026 Oct. 3];2(04):30-46. Available from: https://ijpaerjournal.org/index.php/ijpaer/article/view/4