Greetings of the day dear aspirant

NATA was online till 2016. In 2017 they made it offline. The official question paper has not been released by the authorities. However there are plenty of free sample papers available in the market or on the
internet. So you could check them out. Also, my suggestion would be to purchase a Book of  previous year papers and sample question papers.

https://engineering.careers360.com/articles/nata-answer-key/amp

You can also go through the above links for furtger details.

Hope this helps!!

All the best for your future career