Hello Raja,

The first thing that I would tell you is to maintain self confidence, do not despair, a lot of people get backs and it could be due to a number of reasons. The one thing that you should do, is start taking your studies more seriously and concentrate more on them. Cut back on going out with friends and just wasting your time,instead try to put this time into studying. 

Do not lose hope, just start studying well and you will clear all your backs. Best of luck!