Type nata 2018 website. you will get website of nata. 

On that website they will give you link of tscionhub website . click on it

On that website you will get View response button. Click on it

Enter application no. and password(birth date)

You will come across your personal details. Don't panic. On upper right side there will be option of "CANDIDATE RESPONSE" cLICK ON it. 

In it they will tell you to "click here" . Click on it. A new window will open and wait till it gets download. It will open automatically