Take frequent practice tests. To really commit information to long-term memory, you need to test yourself on a regular basis. Research shows that tests are not only good for assessing how well you know something, they actually help you learn and retain information for the long-term. The process of retrieving information to answer a question fundamentally changes the way it's stored in the brain. The more difficult it is to retrieve the answer, the more securely it will anchor in your mind.
Instead of just passively memorizing information, create practice tests for yourself throughout the semester. Your textbook usually has study questions at the end of each chapter. Answer them. And by answer them, I mean write out your answer just like you would for a real exam. To get the full benefit of this technique, you can't just answer the questions "in your mind."
Ask your professor if she has any old exams she'd be willing to share with you. Take those old exams under real test taking conditions. If they're essay questions, write out the answers. See if your professor will take a look at your answers and offer any feedback.
Flash cards are another way you can quiz yourself.
Studies show that we learn more from our mistakes than our successes, so make sure that after you complete any self-test, you go back and review your answers and find out why you got something wrong.
Practice tests. Do them.
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