Hello Mahima

It is good that you want the previous 5 years' papers of the CBSE Board.

These papers are available subject-wise for Maths, Science, SST, English, and Hindi. They are useful to understand the exam pattern, question types, and marking scheme.
You can download free PDFs from trusted sites like the CBSE official website, Careers360. You can get it by clicking on the link I am attaching below.

CBSE PAPERS CLASS 10TH: LINK