You can opt for Bachelors in zoology, botany, biochemistry, anatomy and many more. It is not always necessary to become a doctor after opting for biology in 12th standard. Further, if you are interested, you can opt for geology, biotechnology, medicine, computational biology, genetics etc. depending upon your area of interest.

Hope this helps.

Hello sugit, below are the career options after 12 th excepting medical

Microbiology

Zoology

Botany

Biochemistry

Genetics

Biotechnology

Food and agriculture.

I hope it will help.

Thanks.