How you approach an exam varies from person to person. Some students prefer to prepare well in advance, while others work best under pressure. Just like many other things, it can take some time before you figure out what works best for you when it comes to studying for your exams.
A good place to start is to ask yourself what you expect of yourself, particularly with regard to grades. Focusing too much on grades before the exam can become a disturbing factor. Wanting to get a good grade can be a great motivator, but it’s important to remember that exams are about more than the final grade - exams are also about learning, comprehension and, in some cases, learning from mistakes and bettering yourself.
It’s important to take breaks, even if you are in the middle of an exam period. Studying around the clock is not necessarily the best idea. Instead, it can be a good idea to study for shorter, more efficient, periods. This will also give you more time for breaks, where you can disengage from your exams to recharge and clear your head.