Generally speaking , first you should Know what timethe exam would take place. Why? Because you can plot a plan for yourself ,then in the countdown days you could know what exactly you need to do. To the plan ,you must make sure it can be achieved by the last day , also everyday you have enough time to handle it ,not just staying in your brain or paper, the final matter is once you finish your plan, i mean before the deadline you can achieve your goal,you need to reward yourself ,so in the Key day ,you would have guts to face the problems and overcome them all. After the exam you are the man in heaven for ever ,trust me ,you can made it , only thing ,you must raise your confidence and courage.