Hello aspirant!  Let me to inform you that Nata is a centralized mandatory exam conducted by coa. The COA is not responsible for conducting a centralized counseling. Instead, the participating institutes conduct their own counselling session. And the students must contact them personally. So you must mention which institute admission you are talking about. You can check the details here :

https://www.google.com/amp/s/engineering.careers360.com/articles/nata-counselling/amp