Positive thinking make your energy and your environment positive.
Sometimes we are facing many problems simultaneously and some problems which are unexpected, we should be calm and try to solve them by our consciousness and try to take help others also. Positive thinking will definitely help you. So be positive, remember that god help those who help themselves,just understand the actual problem and find it's possible solutions.
Exams are the opportunities to test your capacities,so try to do your best,never hopeless anytime and just keep your focus on your study. Hard work has no substitution.Try to do smart hard work.
Time management is also the key of success in any exam.