If you are provisionally accepted your admission then you can change it. But after the document verification if you change the college then you may have to pay some deduction fees in order to get the admission cancelled. This procedure varies from college to college, but the amount will not be that much big. So you have nothing to worry about and if you get you can leave the course and go for the MBBS.

To know more about the career in MBBS visit the link below:

https://www.careers360.com/courses/mbbs-bachelor-of-medicine-bachelor-of-surgery

To know more about the career in BHMS visit the link below:

https://www.careers360.com/courses/bhms-bachelor-of-homeopathic-medicine-and-surgery

I hope this answer helps. All the best for your future endeavors!