Hey Akruti, 

Assuming that you're already admitted in Delhi University, i'm answering this.

*You can buy previous year solved question paper booklet from any bookstore. 

*You can find the past year question in your college library and get them photocopied after issuing.

*You can check the official website of DU www.du.ac.in where there is a folder of past year papers for both UG and PG.

For past year question paper of DU entrances, visit the website,  http://finalrevise.com/detail/DU-MA-Msc-LLM-Entrance-Exam-Previous-Year-Papers-:-Delhi-University-PG-Entrance-Exam-Previous-Year-Papers/1537888435827

Hope it helps, good luck!