hello sir, when we get admission in iit than they require to 75% in 12th board exam , Now sir chemistry mark will be considered in this 12th board's 75%.
hi,
the eligibility for iits and nits, gftis is you need to have 75% aggregate marks (general and obc ) in 10+2 exam from a recognized education board, for sc/st it is 65%. now marks are calculated considering physics chemistry mathematics, any language subjects and any 1 opional subjects, in which you have got highest score.