Hi,

Jee advanced portal asks for the certificates to confirm if you lie in the top percentile (20) of the total student of your board. This is one of the most basic criteria that should be satisfied by the candidate, in order to be Eligible for the admission to any IIT.

contact to zonal IIT, zonal IIT ( the iit which calculated and released my result) was IIT Roorkee,  .

This helped, and they will give you  ‘VERIFIED’ on the portal, and eligible to appear in the JOSAA counselling.

You can produce the certificates later on.

Hope this helps

Wish you luck