Hi Priya.

Unfortuantely, answer keys for NATA 2018 is not rleased till now. You'll have to wait for that to be released. So, please stay tuned to any websites that is related to NATA or websites like careers360.com. Please check this link on a regular basis to get answer key.

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

Good Luck.

thanks for the question 

i am giving you some links go through it it will help you

https://engineering.careers360.com/articles/nata

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

Good Luck