“THE EFFECTS OF SCHOENFELD PROBLEM-SOLVING  INSTRUCTIONAL  STRATEGY ON PERFORMANCE  OF  SENIOR  SECONDARY II  STUDENTS  IN  MATHEMATICS IN GOMBE STATE, NIGERIA” (2025) DYNAMIC MULTI-DISCIPLINARY JOURNAL OF NIGERIA [Preprint]. Available at: https://gagdm.com/index.php/DELSULIBRARYNIGERIA/article/view/155 (Accessed: 5 February 2026).