Dear Priya, the classes might commence anytime in last weeks of August or First week of September after mop up round. This is because after round 2, all the vacant seats have to be filled. And it really doesnt make it meaningful with classes commencing before all the students join. And few colleges have orientation classes which are mandatory for every candidate and these classes cannot be held individually. But last week of August or 1st week of September is an ideal time.