Write your thoughts in a journal. Every day, try your best to record five things that you're thankful of in your life. Or, you can just write down five things that happened in your favor that day. These exercises help you focus on positive thoughts. Having a positive attitude helps your brain process information and remember it.
When studying for an exam, it is important that you allow time for breaks. If you try to force information into your brain and don't take breaks, you won't remember it as well on test day. Your brain needs time to process information in order to learn it; give it some down time after studying for a while to aid in processing. You should be cautious, though. It is important to allow yourself some time to clear your mind, you should also allow yourself time to go over everything that you have learned. Therefore, you want to study for extended periods of time, rather than the few hours prior to a test.
Keep your brain sharp by exercising it often. Playing "brain games" can keep your memory in great shape, and it will also help you maintain an active brain. Simply varying your routine can greatly help fight brain atrophy. You could change the way you drive going home, or you can try learning a musical instrument. Trying to use your brain a lot often could help you improve your memory.
When studying, make sure you dedicate yourself to learning about that topic, and don't allow yourself too many distractions. For humans to truly remember something, it must be stored in their long-term memory. It is very difficult to move something into your long-term memory unless you focus on it without any outside distractions.