Hii Hemnaath!
If you got 60% marks in your class 12th boards, which is a good marks, now it's not the time to repent on it. You can get "good" colleges of your choice if you work hard now and perform well in the entrance examination ( if they conduct it ).  If the College provides admissions on the basis of merit list as per class 12th performance, then it is slightly difficult to get one but, if it's based on the entrance exam , you need to gear up and perform well to get into the College. Hope you understand.
Good luck!