Prolonged study sessions are not the way to go and can, in fact, lead you to be less productive. With that in mind, look to plan short study periods for about half an hour or so and then take a quick break where you can get away from the books for a bit. Follow that up with another short study session and a break. Additionally, find the best period of studying for you; for some, it’s in the morning while for others it can be at night. Also have some “brain food” (blueberries, seeds, nuts, yoghurt, fish, etc.) and eat healthy during your study period and day of the exam.