Dear student,

If you think that you can upload any type of obc ncl certificate, then it's not the case.

If you are getting admission info iits inder obc category, then you have to obtain an obc ncl certificate issued on or after 20th april 2020.
For seeing certificate formats for jee advanced please see the annexure II of the information brochure. :-
https://jeeadv.ac.in/brochure.php

Also, Visit http://www.ncbc.nic.in for latest guidelines
and updates on the Central List of State-wise OBCs.

Now, if you want to get admission in iiits, nits or gftis, then you must download the obc ncl certificate format by using this link :-
https://josaa.nic.in/webinfocms/Handler/FileHandler.ashx?i=File&ii=146&iii=Y

Now, only this format of certificate will be valid for josaa.
So, download the formats using these offical link