Hello Aspirant,

Hope you are doing well!

Yes dear,you will have to upload your class-12th and category certificate on the IISER site,the date for uploading the same will be soon notified to you,and accordingly the portal will show an option of uploading,as the portal is not opened yet according to its official site.

You need to keep checking the website till it opens to upload your documents,

For More Information related to the IISER exam you may go on the link below:

https://engineering.careers360.com/articles/iiser-admission

Hope this was helpful to you!

All the Best!

Keep Smiling :)