CA

You'll have to pass CPT (comman proficiency test) after your 12th standard.

Yes, by doing parallel degree along with B.Com.

It would be better to pursue CA along with M.Com.

If you do CA then you don't need to do MBA and if you do MBA then you don't need to go for CA. Who told you that CA has less finance curriculum? It's completely wrong. CA is totally about finance, accounts, auditing, and taxation and you can do CA after MBA but in my opinion, you should do one of these.

Hi Avinash,
Read this article for details related to CA and its career options:
https://www.shiksha.com/careers/chartered-accountant-23

Yes, you can do both.

BBA, BBA -IB, BBA-CA these three are good. If you go with BBA, you have to go with specialization in the 3rd year of graduation, and after that you can pursue MBA or you can also go for job. BBA-IB deals with the job related to International Business. BBA-CA is related to finance, so you will get into financial sector. Three of these courses are best and can give you good job opportunities and good college to pursue MBA further. So, you can choose your degree in what you are interested at.