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 agoPermanence, perseverance and persistence in spite of all obstacles, discouragements, and impossibilities: It is this, that in all things distinguishes the strong soul from the weak. - Thomas Carlyle