Hey,
BHU PET  the entrance test for postgraduate courses to study  in Banaras Hindu University.
With a proper strategy you can get through BHU PET.
First off,you need to have complete grip over your B.Sc syllabus.The questions would be asked keeping in mind the topics you have already studied in your bachelors.You can refer to reference books.Look up reading materials online.Solve previous year papers as it will help you evaluate your preparation and you can work on your weaker points.Have a positive approach and work hard.
To know about the important dates of BHU PET and eligibility criteria do follow the link given below:
https://university.careers360.com/articles/bhu-pet
Good luck.