Hello dear

The eligibility for applying for CA is

Candidates must have registered/switched over to Common Proficiency Course with Board of Studies of ICAI on or before June 30, 2017.

Candidates CPT registration must not have expired.

Candidates applying for CA CPT 2018 December examination must have a valid registration Id as at the time of filling the application form.

To have more information please look at the link below

https://www.google.com/amp/s/finance.careers360.com/articles/ca-cpt-eligibility-criteria/amp

Hello aspirant,

First and foremost you have to complete your 12th class is basic eligibility criteria.

Steps 

1.competence Proficiency Test or CPT

Else you can complete you degree and  rhen directly attempt IPCC also.

2. Integrated Proficiency Competence Course or IPCC

3. Final Course