CA

Yes more or less as CA has a vast syllabus of commerce such as taxation, accounts etc.

CA thoroughly depends upon maths. It is considered that students with commerce background do well but it is not so as you are from Science background you can pursue CA as your career. But remember it is a hard working job. If you are dedicated towards it than go for Chartered Accountant.

That is a good goal but what is your question?

Yes, but I think you need to go for CA entrance exam first then only you can enroll else it takes alot of time to go through the phases of CA.

Again CA is a diverse field so that you will not get any option but you will become an ultimate CA.

You can go for MBA, because CA should be done with graduation then it will carried on the basis of this only. So better to opt for MBA with specialisation in accounts.

Better option is to go for B.Com instead of BCA and you will get more information on this context.

Yes you can opt for CA as you are about to complete your graduation but you must opt these both together but now also you can go for the same. All the best.