CA

Yes, however, I would advise you to do CA while doing graduation only. Also, BA and CA is rare and not so sought or favorable combination. Instead, you should do CA and B.Com in accounts and finance or B.Com in financial accounting specially designed for CA by the University of Madras and IGNOU
If you still want to do BA economics, then prefer CFA or CS.

If you want to do CA then apply for CPT and clear your CPT and while doing CA, you can do B.Com form any college. If you are doing external .Com, it will help you for doing CA.

Yes, science students could easily pursue for CA .
You can appear for CPT exam. There is no age limit, no minimum or maximum attempts.
Every day, you have to practice 3 hours Accounts and maths.

Yes, you can. Also, have a look at VGU-Jaipur and Chandigarh University.

You need to have maths in standard 12th to become a CA.

Both the fields are incredible in their own way. Being a CA is also an adorable thing because it's considered as one of the toughest exam in India & doing MBA from IIM with good marks means average package of Rs. 1500000. So, it totally depends on you what you want to do otherwise both options are great.

Good evening,
It will be better to do the same.
Thanks & all the best.

Dear Chandan,
You will become a finance manager in a reputed business organisation. Consider all the top companies and apply for the same.
All the best.

Yes, you are eligible to pursue CA. You may apply through direct entry scheme.