Hello,

You can refer to previous year question papers of UKSEE through this site 

http://www.oldquestionpapers.net/2013/01/uksee-10-years-question-papers-previous-year.html 

for IPU you can refer to this site https://www.questionpaperz.in/ipu-cet-previous-year-question-papers/

for DTU you can Refer to https://sakshamsaxena.github.io/Marks/index2.htm

hope this helps you 

ALL THE BEST!