Hi Priyanka,

You should buy previous year papers book form the shop and only buy the latest addition or you can even order it from online sites like flipkart or Amazon or you can visit the link given below:-

1-for the question papers you can visit the link given below:

https://school.careers360.com/articles/hp-board-12th-question-papers

2-For the model papers you can visit the link given below:- https://school.careers360.com/articles/hp-board-12th-model-papers

Hope this will help,please feel free to ask if you have any further queries.

Thank You.