For me also same problem bro..

hi,

see which ever the photo id you may upload your name spelling should be same as in your application and ID,  Candidates MUST upload PDF file of any one of the following valid photo identity (ID): Aadhaar-UID, Passport, PAN Card, Voter ID, College ID, Employee ID and Driving License.

For international candidates, ONLY a valid Passport / Government issued ID / College ID /Employee ID will be accepted as the recognized identification document.

Candidate MUST produce the SAME original valid photo ID proof during the examination time  for verification purpose. In absence of the SAME original valid photo ID proof, candidate will NOT be allowed to appear for GATE 2021 examination center.

however college ID is valid, if you have your name mentioned in the college ID is same as in application form you may upload it.

hope it would help.