Let me guess that, you are asking about the previous year papers for class 10th for both CBSE Board , and NTSE Exam . Solving previous year papers will be very beneficial for you. By this, you will get to know the difficulty level of exam, type of questions asked in the exam, and a better time management idea. So, solve as much papers as you can. Below, I have provided links for both of the papers.
For NTSE previous year papers :
For CBSE previous year papers :
Hope it helps.