Hello Rajshri,

There is no any particular book to prepare BHU UET Entrance Exam. I would suggest you to prefer 10+2 syllabus to crack the exam, You can also go through the previous year question papers to know the level of the questions in the exam. You can download the previous year papers with the given below link.

http://bhuonline.in/old-qus-paper-entr.html

Good Luck!