There is no such criteria. Start focusing on the mistakes you have made in your pre board examinations. Get answers about the question you were not able to attempt, take help from your peers, and teachers to know about the way answer should have been attempted, what could have been done to score well. If you were not able to attempt pre board examination completely then try to learn about time management.
Editor answered 11 years agoLove isn't something you find. Love is something that finds you. - Loretta Young