Hey there

You can go for CA after 12th. This course is not for students who have just passed 10th. For CA you need to qualify ca foundation. Then you need to clear the intermediate groups. Then comes final groups which are considered the toughest. Once you complete all these you'll become a certified CA.

check ca eligibility

https://www.google.com/url?sa=t&source=web&rct=j&url=https://finance.careers360.com/articles/ca-cpt-eligibility-criteria/amp&ved=2ahUKEwjNyJbg37XlAhVk73MBHWCTBH0QFjAAegQIBBAB&usg=AOvVaw1o-_pKbHjMbEzA4pyZdE06&ampcf=1&cshid=1571949553315

Good luck