The main objective of the study was to study the effectiveness of chemistry teaching by activity method, smart class and demonstration method on academic achievement of high school students. To obtain the above objective 3x2 ex-post facto research design has been used. 120 students of high school studying in English medium, private schools of Jabalpur (M.P.) were selected for the study. For the implementation of the study lesson transcripts based on activity method, smart class and demonstration method have been used. Finally Achievement test in Chemistry has been implemented on the students. The finding of the study shows that Academic achievement in chemistry is higher among the students of high school when they taught by the Activity method.