Hi Raghu!

You can simply quit the college if you do not wish to continue further. You can contact your college authorities to get detailed procedure about quitting the college/course. And then you can take admission in Bsc in any college you are interested in. But you need to start again from the first year and might be they will ask about the gap (which occurred due to BHMS course: first year). You can check out the scope and colleges available which offer BSc in India here:

https://www.careers360.com/courses/b-sc-bachelor-of-science

Thankyou!