Hello Rohit

Your Percntile score in JEE mains is very less . So by less percentile you will not qualify for JEE mains and if you not qualify mains then you will not get admisssions in NIT .I think you should go for April Attempt . Work Hard till april ,score above 85 percentile and  then their is chances for getting admissions in NIT .

If you dont want to give second attempt then you should try private univerity exams or state CET exams which will help you in get proper college.

I hope you get my point.

Thank you and GOOD LUCK!!!