Hello Sudhir, NITs don't take admission through board marks. They take admission directly through the marks scored by the candidate in the JEE Mains Exam. Although you need a minimum of 75% marks or you should be in the top 20 percentile in their class XII exam conducted by the respective board to be eligible for filling the application form. SC/ST candidates need to score a minimum of 65% marks in boards but the final merit list is decided on the basis of JEE Mains marks.