hello

After you complete your 12th in science you can basically persue any of the honors on the basis of your marks like chemistry, physics, biology, microbiology, maths, computer science, botany, zoology, lifesciences, English, electronics and many more. There are many bsc programs also (not honors) like mathematical science, physical science, industrial chemistry, etc.

You can even change your field and you whatever course you please with deduction of 3-5% (varies in different courses).

All the best!