It is a good decision to study COMMERCE with Computer Science as a subject in 11th and 12th class but as you are interested in B.com then it will not give you more benifits for this programme.
 Career options for you after this. You can  apply for Accountants in Banks and Companies and can also go for the COMPANY SECRETARY Courses or BCA also.


Good Luck!

Computer science generally comes under the science stream so incase you are getting in commerce you can take up BUT the point is you have a different goal as you want to go for Bcom in Banking etc..

So there is no point taking computer science in that case.
You can choose related subjects of your interest in 11th and 12th.

Even if you take computer science you can face a bit issues further because it will get conflicted with science and commerce streams.

Let me know incase you have any other confusion.
All the best!