Hello,

You can go and check  the official website of the NATA there would be a portal to upload marks. You can upload it there. here is the link, you can contact them and ask for solution if any mistake is done.

link:- http://www.nata.in/contact.html

They can guide you better and accurately as they deal with those things. Check the link for eligibilty:- https://online.cbexams.com/nata/images/gazette.pdf?v0

Hope it helps!