HELLO! SANDEEP
To clear semester paper of previous back you should go through organiser.Organiser is collection of previous year semester paper.Generally in semester examination question get repeat from previous year paper.So solve pervious paper you will get lot of idea about paper and see answer of questions if you won't able to solve paper.You will definitely  score good score after analyzing previous year semester paper
You can ask if you have any other queries.
GOOD LUCK!