Before the examination day

Before dropping to sleep and upon waking up on the exam day, pray. Thank God for the chance and ask for His light and strength for this activity. Ask Him to keep you calm and without fear. Then trust Him and trust your own best effort.
A word about feelings. Hurt or angry feelings right before a major examination can prevent you from recalling and answering the questions well. If you lost something, your parents scolded you or someone hurt you and you cannot put the problem off your mind, see if you can do something quick but satisfactory about it before taking the exams. But leave enough time for you to absorb the effect of your solution. Oftentimes, the solution requires a confrontation which is almost always painful and heals slowly. It is a choice between confronting the hurt before or after the exams. If you do so before, at least you are doing something to solve it. If you reserve the confrontation till after you finish the exams, you are sure to be affected by it in your mind and heart during the exams. But of course there too is the risk of getting even more hurt if the confrontation happens before the exams. You cannot keep it off or “forget” it for a while. It is not subject to the control of the will. It affects the emotions or feelings which the will cannot tackle unless directly and sufficiently addressed. It is really a personal choice, but the danger of not tackling the problem before the exams is that you may really be procrastinating when you put it off.