Students and teachers, in a large classroom environment (with over 100 students), faces difficulties in carrying out the lecture session like visibility and audibility of lectures, student-teacher interaction and monitoring the students. Avabodhaka an ICT (Information and Communication Technology) based e-learning system, addresses the difficulties of a large classroom. In this paper we present an extension work on the system Avabodhaka. We present a technique to estimate the students' attention and understanding level using the system. Based on the interaction and activities of the students during the lecture, the students' attention level and understanding level are estimated. Using this information, a teacher can take different steps for the development of the students. We evaluated our technique by experimenting in a classroom environment and compared the results with the ones reported verbally by the students. The results given by the system were found to be close to the actual results with a tolerable deviation.