In Kenya, most of the citizens are accessed to education due to the government commitment and establishment of free education in secondary schools. Despite of all the effort, the sector of education continues to face many challenges, especially the declining performance of students in Kenya Certificate of Secondary Education (KCSE) in day public secondary School. Timboroa zone in Tarakwa sub-county is among the many observing poor performance in KCSE in the past four years. So, the intentions of this study is to determine the factors or determinants resulting to dismal performance in national examination (KCSE) in Timboroa zone with specific focus on all public day Schools. The goals of the study was to examine the influence of; financial challenges, the student's discipline and the distance from home to school on academic performance at Timboroa zone. The design of research used was descriptive. The target population comprised of: schools' principals, teachers, and the students of public day secondary schools in Timboroa zone, Uasin Gishu County. Interviews and questionnaires guides helped to collect data. Statistical Package for Social Sciences (SPSS) was used to compute data and it was presented and analyzed in percentage, frequency and bar graph.