Make sure you know where your professors' offices are, when they hold office hours, and what their e-mail addresses are. Be sure to keep all of your materials for each class together and routinely review your notes. There is nothing worse than beginning to study for an exam the night before and having to round up all of your notes from three or four different notebooks and put them in order. If you have to do this, you will be tired before you begin to study. Decide, from the beginning, what is the best way to study the material for each class.
Flash cards work well for classes with a lot of terms and definitions.
Drawings, outlines, or graphic organizers work well for more conceptual classes. Always be sure you have some study materials with you. You may not realize it, but there are a lot of study opportunities you miss each and every day. You can study between classes, while you eat lunch, or while waiting to meet a friend. If you begin studying from the first day of each clas and keep up by routinely reviewing the material and using the resources at your disposal, you will find that when exam time comes, you will be ready for it.