Hello sourav,

You can pursue business studies even if you took up science in your +2. As most subjects taught during graduation or in professional courses are new there wouldn't be much gap for you to cover. The only place where you could lag behind would be accounts which can be easily corrected by taking tuition and  putting in the extra hard work.

If your focus is business then for your bachelors you can go for a BBA and then MBA. Although if you are interested in finance as well and would want to enhance your career there are some professional courses that you could do. Like
1. CA
2. CFA
3. FRM
4. CFP

For more details please follow the link below
https://www.careers360.com/courses-after-12th-commerce

Hope this helps.
All the best!