Hello,

You need to know where you are doing wrong, check the procedure of your answer and see where you are committing a mistake and rectify it. Practice as many problems as you can. Improve your accuracy so that you can get less negative marks which which increase your score. Practice different kind of sums. First understand the question clearly and think of how you can solve what all formulae you need to use and start solving it and try not to commit calculation errors most of the students get tensed and tend to do commit calculation mistakes even though they know how to solve the sum. So you need to calm yourself at the beginning of the exam and try to stay relaxed so that you can give the best of yourself. The only key is practice.