CA is a correspondance course .If you want to become a CA then first step is to qualify CPT exam for which you will be eligible after qualifying class 12th .
Other option is that, after your graduation with atleast 55%marks in commerce stream or 60% in other stream you can directly appear in IPCC exam ,i.e.,second stage.
Third stage is articleship training under practicing chartered accountant.
Last and final stage is final exam.

C. A. Course comprises of 4 Important Levels

1) Common Proficiency Test (CPT)
2) Integrated Professional Competence Course (IPCC)/IPCE
3) Three years Articleship/ Training under a Practicing C.A
4) C. A. Final

Register with the Institute of Chartered Accountants of India (ICAI) for Common Proficiency Test (CPT) after passing class 10th examination.

Good Luck!!