hi,

bhu uet exam is the entrance exam for bachelors degree courses in banaras hindu university and it will cover both 11tth and 12th syllabus, since questions are of mcq type , there is less chances to make any suggestion, topics from which questions will be formed for bsc agriculture is

Mental Ability, Chemistry, Physics & Mathematics, Botany & Zoology, Agriculture.

however I suggest you to study your text books ins and outs to solve 90% of questions.