Subject related issue

No, Its not necessary.

Sir, I have Maths right now but i want to leave it because my most of the efforts get diverted towards mathematics which is my 5th subject... Sir please suggest me my decision is right or wrong..

For CPT, it's not mandatory to have Mathematics in 11th and 12th. The Maths for CPT can easily be covered in your CPT classes.
As far as keeping maths as a subject in 11th and 12th is concerned, the cut off for many reputed colleges require having mathematics. Leaving maths might limit your college options.
However, If you're pursuing CA, college doesn't matter much.
Consider all pros and cons before taking a decision.
All the best.

Thank you so much sir...😊