Hey there

There is no boundation for maths in 12th in CA but unfortunately you will find maths at every groups in CA. Also if you'll have good hands on maths then your calculations will be fast and they will help you a lot. See no one is going to tell you to find the locus of a given equation in CA but basic maths is required. Hope you understand.

Check details about CA

https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.careers360.com/articles/4162-Chartered-Accountancy-CA/amp&ved=2ahUKEwjs7_mwu63lAhXSH7cAHXNvC6UQFjAAegQIAxAB&usg=AOvVaw2eeWZxl833ey1fj0R5IMWw&ampcf=1

Good luck

Dear Arun, even if you do not study Mathematics as a subject in your 10+2, you are still eligible for studying CA. There is no particular discipline that you should have completed your 10+2 to be eligible for studying CA. For being eligible for CA Foundation, you should have completed 10+2 and a study period of 4 months. So even if you do not study Mathematics in your 10+2, you are eligible for studying CA.