This document summarizes a dissertation on factors affecting secondary school performance in Kilungu District, Makueni County, Kenya. The dissertation examines how teaching and learning resources, head teachers' instructional supervision, teachers' professional qualifications, and teaching experience impact student performance on the Kenya Certificate of Secondary Education (KCSE) exam. The dissertation presents literature reviewing previous studies on these factors in other areas of Kenya. It finds that inadequate resources, lack of teacher experience and qualifications, and insufficient supervision can negatively influence exam scores. The dissertation aims to determine the impact of these factors specifically in Kilungu District secondary schools.