75% percentage should be in 12th class (including all subjects).

The five subjects will be taken into account for calculation of percentile of qualifying examination marksfor paper 1(B.E./B. Tech.)of JEE (Main) which are:

1-Language
2-Physics
3-Mathematics
4-Any one of (Chemistry, Biology, Biotechnology, Technical Vocational Subject)
5-Any other subject

Note: If a candidate has appeared in six subjects in the qualifying examination, the subject (fifth or sixth) with better marks will be considered.

Good Luck.