This research study focused on investigating "The effects of classroom interaction on students' academic achievement at secondary school level". The main objective of the study was to see the students' academic achievement with and without classroom interaction. The study was significant because it tells about the effects of classroom interaction at the secondary school level. The population of the study was all the secondary level school students. 60 students studying in Class 9 th of University WENSAM School and College were taken as the sample of the study. The study was experimental, and pre-test, post-test were used for the collection of data. The experimental group was taught by the classroom interaction and the control group without classroom interaction method. Mean Standard deviation, variance and the difference between means t-statistics were used for the analysis of data. The result showed that experimental group performed significantly better than the control group on the post-test. It is recommended that teachers should adopt interactive learning style in their classrooms because it actively engages students in the learning process. Teachers may be provided support so that they may implement various interactive activities in the classrooms.