Hello Aspirant,

To get admission for science degrees you need to pass 12th in PCM , most of the B.Sc subjects will demand a pass in PCM . But B.Sc (hons) is an in depth study of a particular subject ,so may be for few subjects that does not involve math ,like biology (you will need biology in 12th as main subject), a pass in math may not be compulsory . But this eligibilty criteria varies with every college, so the best way to know is by visiting the official website of the college you wish to join and check about the same.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://university.careers360.com/colleges/list-of-bsc(hons)-in-chemistry-degree-colleges-in-india&ved=2ahUKEwiz7sXX15DuAhU2yjgGHVFNCXAQFjAJegQILBAB&usg=AOvVaw2XuV08DPqitrgEtivz5_k8

All the best