This study investigated the effect of the use of Advance Organizer on senior students’ performance in chemistry in Lagos State.  The research sample comprised of eighty chemistry students randomly selected from two secondary schools in Eti Osa Local Government of Lagos State. The instrument for the study was a chemistry achievement test comprising of 50 multiple choice questions. It was found that advance organizer improves performances and retentive memory of students leading to substantial gain in learning outcomes. These findings tend to suggest that some of the problems encountered by chemistry students may be rooted to the fact that certain topics in the syllabus require different approach other than the conventional method, others that require high cognitive ability should be handled with a strategy which will enable students to delineate clearly and precisely the differences between new learning, this will help the students to grasp the learning task with few misconceptions leading to the emergence of less confused new meaning which will improve students’ performance. Based on the findings from the study, it was recommended that teachers should use advance organizer strategy in addition to the existing strategies to improve the standard of performance of Nigerians secondary schools chemistry students.

Keywords: Advance Organizer, Performance, Retention, Students, Chemistry,

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