It was earlier to be said to start on 16th of August but as of now as per the recent news, the application form for the second attempt might be released on 24th of August ie today itself. So stay tuned to the official website for the same. You will need to register yourself, pay the fees and then take a copy of the application form for yourself for proof.

Refer to the site below for knowing more about the same..

https://engineering.careers360.com/articles/nata-application-form

Thank you.