Hello neeraj,

The previous year papers are very important aspect of an aspirant's preparation. With the help of these papers candidates can get help in the following things:-

1. It helps to improve one's time management, accuracy and efficiency.
2. It helps to detect the weak and strong areas
3. It removes the nervousness of the candidate while practicing regularly.

For more information you can check out the link given below-

https://engineering.careers360.com/articles/jee-main-question-papers

To check the sample papers you can visit the link given below-

https://engineering.careers360.com/download/jee-main-sample-papers-previous-years