Bringing interactivity and effectiveness of teaching in the classroom is always challenging especially in the developing countries. Previous studies show best practices of smart technologies in the classroom.This research was conducted to develop an efficient and low-cost solution for teachers in managing the higher number of students, assessing progress and increasing student engagement in the classroom. We developed My Class Manager; a Smartphone application for quiz and paper marking, audio quiz for native language learning and performance management throughout the semester. We conducted a series of five evaluations of three classes of sizes 30, 35 and 40. Results of the evaluations show an increasing interest of students in the classroom, improved class engagement & attentions. It creates a time-efficient learning environment.