CA

After 12th, you have to appear for CPT. It is conducted twice a year then you have to go for IPCC (two groups). After clearing 1 or 2 group, you can start your training and after that you have to appear for your last and final exams in two groups.

Both CA and CS are good options. It depends on your ability and skills. CA has more prospects and job opportunities as compared to CS. But many companies offer amazing salary to CS. If you are trying to pursue B.Com + CA, you will need to study at least 4 hrs every day. Also, you will need to do an article ship to get the CA / CS certification.

Hi Mohit,
You can look for PG courses in finance, accounts, and management field on the basis of your interest. Many universities offer finance and accounting programs at par with CPA or CMA. There are some options available on Shiksha's study abroad section, here is the link:
https://studyabroad.shiksha.com/mba-in-accounting-from-abroad-ds11508247?country=uk-australia-newzealand

Yes, you can directly pursue CA-IPCC only if you have completed your graduation and you have secured an aggregate of 55% throughout in your graduation.

Yes, you can do it.