Hi Sushmita,

 Cast certificate is necessary for CA Foundation registration form. Also Following documents are required :

1. Online print out registration form duly signed by candidate itself.

2. Attested copy of either admit card or marksheet of class 12th examination issued by respective board.

3. Recent coloured photograph should be affixed on the hard copy of form.

4. Attested copy of Nationality.

5. Attested copy of proof of special category like SC, ST, OBC, or differently abled.

6. Attested copy of 10th marksheet or 10th admit card indicating name and date of birth.