Try to explain the material in your own words, as if you are the teacher. You can do this in a study group, with a study partner, or on your own. Saying the material aloud will point out where you are confused and need more information and will help you retain the information. As you are explaining the material, use examples and make connections between concepts (just as a teacher does). It is okay (even encouraged) to do this with your notes in your hands. At first you may need to rely on your notes to explain the material, but eventually you’ll be able to teach it without your notes.
Creating a quiz for yourself will help you to think like your professor. What does your professor want you to know? Quizzing yourself is a highly effective study technique. Make a study guide and carry it with you so you can review the questions and answers periodically throughout the day and across several days. Identify the questions that you don’t know and quiz yourself on only those questions. Say your answers aloud. This will help you to retain the information and make corrections where they are needed. For technical courses, do the sample problems and explain how you got from the question to the answer. Re-do the problems that give you trouble. Learning the material in this way actively engages your brain and will significantly improve your memory (Craik, 1975).