hi,

see bhu b pharam entrance syllabus is includes 10+2 course. you need to study physics, chemistry, zoology , botany subjects of both 11th and 12th. question level is moderate and if you have text book of 12th course you may revise and practice from there. also in bhu website you can have access to previous years papers.

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