Hello Apoorva Trivedi,

DUET is Delhi University Entrance Test which is conducted by Delhi University in order to offer admission in undergraduate, postgraduate, MPhil, Ph.D. Program. There will 3 sections which basically comprises of:-

(A) Mathematics

(B)Reasoning

(C)Analytical Abilities 

The duration of the exam is around 2 hours and it is multiple choice based question paper. If you want to know more click on the link to get some more additional information:-

https://www.careers360.com/exams/delhi-university-entrance-test

Hope this helps.