The class or subject teachers used classroom management to describe the process of ensuring that classroom lessons run smoothly despite disruptive behaviour by students; it is also known as class control. This study examines the relationship between classroom management and students’ performance in public secondary schools’ examinations in Ado-Odo Ota Local Government Area, Ogun State, Nigeria. A field survey was carried out among the class teachers in some selected public secondary schools within Ogun State, Nigeria. A structured questionnaire was designed as an instrument for data collection from respondents. Eighty respondents were interviewed through the questionnaire. Pearson product-moment correlation statistics use in analysing the data. The result of the hypothesis test revealed that there is a significant relationship between classroom management and students’ performance in public secondary schools’ examinations. The study concluded that a variety of classroom management techniques will keep students organized, orderly, focused, attentive, on task, and educational productive during their examinations. The study further concluded that the government and stakeholders in the education sector should organize seminars or conferences that will train teachers on how to manage their classrooms perfectly without stress.