Can I go CA (Chartered Accounts) after B.Sc 3rd year

Abhishek, CA is a course that you can go for after 12th as well as along with graduation. And if you have interest in CA, that what is the use of doing B.Sc. Better for you would be to go for BBA, B.Com, BBA-MBA, B.Com-M.Com, B.Com-MBA etc, that are going to help you further career as a CA. There

Yes, you can and you will even be exempted from giving CA foundation if you have scored more than 60% in your graduation. In other case you need to go through foundation as well.

Yes, you can go for CA.

You can do but after b.sc is not value

CA can be pursued along with your graduation.