Hello aspirant, here are the certificate required for the document verification..,

• The gate2019/GPAT 2019/PGECET 2019 score card of rank card and hall tickets
• degree original certificates and marks memo
• intermediate(12th class) or diploma original certificate and marks memo
• ssc marks memo and original certificate
• study certificate from 10th class to graduation
• caste certificate
• residence certificate
• Graduation transfer certificate
• Income certificate
• ration card
• aadhar card

Hello aspirant

It is only necessary if you want fee reimbursement or scholarship purpose.

If you are not in ews or OBC NCL category then you  don't  need so don't worry about it

https://www.google.com/amp/s/engineering.careers360.com/articles/ap-pgecet-counselling/amp