Admission to NITs will be based on All India Rank of JEE. Here I am giving you idea for the minimum marks required in 12th to get admission in NIT

Required Criteria based on Class 12th / Equivalent qualifying Examination:

B.E/B.TECH
Must have passed XII with Subjects: Physics, Mathematics and one of the subjects from (Chemistry, Bio-technology, Computer Science, Biology) along with 50% marks in total including all subjects

B.ARCH/B. PLANNING
Must have passed XIII with Mathematics subject along with 50% Marks in total including all subjects