I understand your query regarding the non creamy lawyer  certificate as i would like to give you a brief about this as follow in which documents which are required for it is mentioned:

• Identity Proof: PAN Card, Aadhar Card, Driving License, Voter ID Card, etc.
• Address Proof: Aadhar Card, Valid Passport, Utility Bill, Property Tax Bill, etc.
• Passport Size Photographs: Two passport size photographs of the applicant.
• Income Proof: Income Certificate, pay-slip of the last three years of income tax returns.
• Caste Proof: School Leaving Certificate, Self Attested Caste Certificate.
• Relationship Proof: Affidavit attached with the application.

It is valid for 3 years and if it demanded then you have to show or give zerox but dont give orignal one.