hi,

see the eligibility criteria for admission in nits, iits or cftis is candidates who belongs to general category / obc must secure at least 75% aggregate marks in 12th exam, however for sc/st the marks criteria is 65%. or the candidate must comes under top 20 percentile of board exam of the respective board.  so it does not matter whether you have got 80% in mathematics, cause individual maths marks is not consider,