Manvi, you haven't mentioned your JEE Mains percentile. But you can calculate your JEE All India Rank by using the formula: 100-your percentile*869010/100 where 869010 is the no.of Candidates who appeared for JEE Mains January session. Now with 64.6% in your 12th, as a Candidate belonging to ST Category, you should have secured a minimum aggregate of 65%. With 64.6%, unfortunately you do not qualify for admission to NITs. You might have to appear for Improvement exams. Please visit our page for cut offs of MNIT: https://engineering.careers360.com/articles/jee-main-cutoff-for-mnit-jaipur