First of all try to avoid expenses / over crowded classes,
1) Try to seek knowledge from the younger people who had been recently pass out from the class you are in.
2) Give the respect as you give respect to Parents & God
3) Try to discuss the subject in free time
4) Try to get classes where you friends are not going
5) Be particular about the homework & practices given by the professor
6) Share your problems with the professor, they are the best guider
7) Try to impress your professor, with extra knowledge