Hey Mridul
You can download sample papers of different streams for bhu uet exam from https://university.careers360.com/download/bhu-uet-sample-papers-previous-years?sort=recommended As far as I know BHU has released the link for BHU 2020 mock test on their official website at bhuonline.in so you can visit the site and check the mock test.
All the best.
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