Your grades can really effect on what type of college you can get into. Tests are very important in every class you take. You should make sure you get plenty of sleep the day before a test. The amount of sleep you get can immensely reflect how you do on a test the next day. Dr. Doback, a leading professorial in the field of physiological studies believes you need to get at least eight hours of sleep, or the next day your body may not be able to function at its highest ability. Therefore getting sleep is essential for taking tests. So make sure the day before every test you get at least eight hours of sleep so you can perform at its very best.