it really depends on the course. For example, for math related subjects, working the problems over and over until you get them right (and working out where you went wrong on incorrect answers, is need.) For literature, anything history related, psychology, etc, I personally found it helpful to make friends and ask each other questions that we think may be asked and brainstorming answers and comparing notes on our assumptions and answers. I found that depending on the class, these tactics worked for me: - written notes with highlighted key areas the professor seemed to emphasize - talking through the notes and topics with classmates in study sessions - flashcards where you have words to memorize or definitions to memorize - asking the professor during his office hours for help or clarification of anything I'm confused about (well before test day) I found writing it, speaking it, and reading it combined, helped it stick in my brain. Just reading the material wasn't always enough.
Hope this helps!