idk, study harder? I really don't know what to say here. Maby get one of those red bulls. The commerical says they increase mental alertness and concentration. You could also try working out but that seems pretty obvious. If your not the moral type you could always cheat. Ipods nowadays have a feature that you can talk into a mic and listen to it later. You could also write answers on a small piece of paper and slip it in between the exam pages. Try not to get caught.