Hello,

To pursue B.Sc Chemistry you must have passed 10+2 with Mathematics, Physics and Chemistry from a recognized board with minimum percentage of marks. You need to fulfill the eligibility criteria laid by the concerned authorities to get admission in a college in the preferred course. So if you have studies Biology, Physics and Chemistry in 10+2 level you are bot eligible to get admission to B.Sc Chemistry but if you study Mathematics and pass in the subject through open schooling you can pursue the preferred course.

To check more details please click on the link below

https://www.careers360.com/courses/chemistry-course#:~:text=Eligibility%20Criteria%20(UG%20%26%20PG)%20of%20Chemistry&text=degree.&text=A%20minimum%20aggregate%20mark%20of,guidelines%20of%20the%20university%2Finstitution.