Participate in class and take good notes.

Keep a calendar so you can organize and remember your assignments, papers, and exams. Get to know a few people in each of your classes whom you can contact if you are unclear about something or have to miss class. Some people like to form study groups. This has been found to be effective if you prepare for group meetings so you can be a contributor as well as a receiver. But always make sure that you know and understand the material and can work problems on your own outside of the study group.