Dear Pankaj BHU PET ( Banaras Hindu University PostGraduate Entrance Test) will be conducted tentatively during the month of May. M.A, M.Com, M.Sc entrance exam will be conducted between the 2nd and 4th weeks of May. The dates haven't been officially announced as yet. So keep an eye on the official website. The exam will be conducted in 3 shifts from 8am to 10am, 12 noon to 2 pm, 4pm to 6pm. 

Hii

To get admission into BHU in post graduation, you need to appear in BHUPET exam which would be conducted in offline mode.
Here are the important dates that candidate needs to know-
Application process- december 2018 to second week of february 2019
Admit card release date- 1 week prior to th test
Exam Date- Second week of may to third week of may
Result - third week of june

Exact dates would be announced later on the official website.
Stay updated by visiting official website and careers360 news updates on the article with link as below-
https://university.careers360.com/articles/bhu-pet

Hope this helps
Thanks!