Solve as past years papers as many as possible and time yourself as if you are appearing for the final exam. There is no other exercise better then this. This makes you use to tests/exam and in your final exam you will not even feel that you are doing something different since most of the questions are repeated with some data here n there. Do not panic and do not be over confident. At times its a tendency to start solving 1 question per section AVOID IT and do it and once you have attempted entire paper and if there is time do it. Also, at times there are wrong questions in the exam so do not panic and beat around the bush to solve such questions go to another one immediately if you find anything wrong there just leave that some space to complete it later DO NOT CANCEL IT since you get full marks for attempting wrong questions. ALL THE BEST and GOOD LUCK! GOD BLESS YOU ALL!