Hello Praveen,

If you have scored 63% iin class 12th examinations then i would like to tell you that you are uneligible for JEE Mains becuse the minimum requirement for JEE Mains examination is 75% for general category and 65 % for SC/ST Candidates. That means you can't take admission in any IIT's/NIT's/IIIT's and GFTI's. I would suggest you to look for other institutions where the minimum eligibility is below 60% and take admission on JEE rank basis.

All the best !