You haven't mentioned the Home State you belong to. Nevertheless,NITs with a score of 64 which loosely translates to an approximate percentile of 87 is tad difficult. Now this is based on 2019 data and cut offs change every year. Cut offs depend on various factors such as total no .of seats available, difficulty of the exam, previous year cut offs, no.of Candidates appearing for the exam and no.of Candidates applying for a course. Please use our College predictor for the complete list of Colleges that you may have a shot at: https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer