You should study a little bit every day, so that you're not overwhelmed. Studying the night before or the day of the test is the worst thing that you can do. You should study for 20 minutes and then take a short break and study for another 20 minutes. During the break, you can go on a walk, check your e-mail, or talk on the phone. Then, you can take study for another 20 minutes and then take another break and study for another 20 minutes. You should study for a grand total of 60 minutes. Studies have shown that people remember the first and last things that they read or hear. This method will allow you to have six peaks, so you'll retain more information.
Pay very close attention to words that are in bold or words that the teacher talks about often in class. Read the review section--if there is one in your textbook.