I have passed class 12th from Commerce and now I want to become CA and for that I want to get the procedure and eligibility for C.A course so can you provide me that?

As you want to get the procedure and eligibility for C.A course so here is the information of the same for you:

Educational Qualification:
Candidates must have passed Senior Secondary Examination (10+2) or equivalent recognized examination. There is no restriction with regard to the marks secured in Senior Secondary Examination or subjects studied

Or

Graduates who have secured less than specified marks:-

Commerce graduates with Accountancy, Auditing and Mercantile Law or Commercial Law as full examination paper. For this purpose “full examination paper” means a paper carrying not less than 50 marks.
Non-commerce graduates with Mathematics as one of the subjects and with less than 60% of the total marks.
Non-commerce Graduates with subjects other than Mathematics and with less than 55% of the total marks

Age:
There is no restriction with regard to the age of the candidate or marks secured in Senior Secondary Examination or subjects studied.

How to become a Chartered Accountant?
Step 1
As a first step the eligible candidate has to register for the Chartered Accountant- Common Proficiency Test (CA-CPT). Students have to forward their applications in the prescribed form along with the prescribed fee through Demand Draft drawn in favour of The Secretary, Institute of Chartered Accountants of India payable at New Delhi

Step 2
Once cleared their CA-CPT exam the candidate is supposed to register himself for Integrated Professional Competency Course (IPCC). This course is also known as CA inter in the common parlance. To register for IPCC Students have to forward their applications in the prescribed form along with the prescribed fee through Demand Draft drawn in favour of The Secretary, Institute of Chartered Accountants of India payable at New Delhi, Mumbai, Kolkata, Chennai, Kanpur as the case may be.

Step 3
Register student for CA final Course are eligible to take the exam after completing their compulsory training and ITT of 100 hours.