punjabi university previous year question paper is available on 

http://questionpaperesult.com/punjabi-univesity-question-paper/

Thanks for the question. I have attached few links where you will be able to find some sample as well as previous year's papers. 

https://www.ilmkidunya.com/past_papers/punjab-university-bsc-mathematics.aspx

http://www.indiastudychannel.com/question-papers/Index.aspx?UniversityId=94

https://www.google.co.in/amp/s/admission.aglasem.com/pu-cet-previous-year-question-papers/amp/

All the best