Zudonu, Onisoman Chuks. Ph.D; Ikwut Emmanuel Friday. Ph,D; Nnam-Obi Chukudi Victor. Ph.D; Charles Onyije. Ph.D; Olowu Clifford. EFFECT OF STANDARD MATERIALS ON STUDENTS’ ACADEMIC ACHIEVEMENT IN CHEMISTRY IN SENIOR SECONDARY SCHOOLS IN RIVERS STATE. bwjournal 2025, 2.