Here are some  steps to check if you are non aadhar candidate:

Check JEE Mains Application Form:

• Log in to the JEE Mains portal using your credentials ( https://jeemain.nta.nic.in)
• Go to your application details.
• Look for the field where you entered identification information.
• If you provided any other ID proof (like Passport, Voter ID, Ration card, etc.) instead of Aadhaar, you are a Non-Aadhaar candidate.
• Review the confirmation email or PDF of your submitted application.
• It will mention the type of ID used (Aadhaar/Non-Aadhaar).

If you're still unsure, contact NTA Helpdesk through email or phone to confirm your registration status.

Hope you get this and find this info useful

Best Wishes.