Hello Shubham.. As you have completed your 12th in Biology, you can go for bio related courses if you are interested. There are a number of courses other than MBBS and other medical courses. Some of the courses are Bachelors in Agriculture, Food Technology, Pharmacy, Lab Technology, Nutrition and Dietetics, Physiotherapy etc. You can also pursue BSc in core science courses like Botany, Zoology, Physics, Chemistry, Biotechnology, Microbiology, Biochemistry, Forensic science etc. Some of the best institutes for these courses are Delhi university, Banaras Hindu University, Lovely Profession
It is possible to go for B.Com after 12th in science with biology or maths. You can visit the websites of Delhi university, Sharda university, Lovely Professional University, Christ university etc to get the details regarding the fee structure, course structure, scholarships etc.