Whether biology marks are calculated in jee main along with pcm for eligibility jee main
Adithya, if biology was your optional subject in boards, then marks of biology will never be calculated for eligibility in jee mains, only marks of compulsory subjects are calculated along with pcm.

The 5 subjects for B.Tech/ B.E. are:
1-Language, 2-Physics, 3-Mathematics, 4-Any one of (Chemistry, Biology, Biotechnology, Technical Vocational Subject), 5-Any other subjects
For more details refer https://engineering.careers360.com/articles/jee-main-eligibility-criteria
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