If you want to go for the UPSC examination and want to download the previous year question papers, then you can obviously visit the official website of the UPSC and can download the question papers from the directory available. To download the UPSC question paper visit the link below:

https://www.upsc.gov.in/examinations/previous-question-papers

To know more about UPSC preparation tips, visit the link below:

https://competition.careers360.com/articles/how-prepare-for-upsc-ias

I hope this answer helps. All the very best for your future endeavors!