One of my friends from school attends Thapar University. Here is his insight regarding the class timing at the institute.
Try to enjoy the first semester as it is one of the least credit semesters. Manage your time properly. You will be given a week off before Mid Terms and the end semester to study.
Do attend labs as they are easy and you will get free attendance. Try to maintain a good relationship with TAs. If they are on your side, you are most likely to score well.