Get lots of sleep during the weeks leading up to your exam. When you study, it is important to make sure your body and mind are adequately rested. Avoid going out late and get in bed at a decent hour to make sure you have enough sleep to get you through any upcoming study sessions.
Exercise to get your energy levels up. Many people think that exercising will make them more tired, but the opposite is actually true. Exercising gives you a mental boost and can significantly increase your energy levels. Try working out before you have to study to help stay awake, or bring your books to the gym and study as you walk on the treadmill or use the stationary bike.
Take a multivitamin to help you balance any minerals or vitamins you might be lacking in your system. When your body is not receiving enough vitamins (a large possibility when you live a student lifestyle) you might be left feeling fatigued. Take multivitamins to help replenish your stores and make sure your energy levels are high.
Talk with your doctor if you cannot muster the energy and mental focus required to study. If you find yourself tired just reading, you might have an underlying problem like an iron deficiency, lack of vitamin B12 or even a condition known as mononucleosis, which causes extreme fatigue. Talk with your doctor so you can get to the root of your problems.
Drink caffeinated beverages to give yourself an added boost. If you have postponed your studying until the night before an important test and have to pull an all-nighter, drink coffee or energy drinks to provide an added boost. Be careful doing this, however, as you will only have energy for a little while before you crash.