How much placements salary students get after studying in Bhola Paswan Shastri Agricultural College, Bihar Agricultural University?

Basically, for applying to ICAR in B.Sc Agriculture at the Bhola Paswan Shastri Agricultural College, there is a fair enough ranking required for almost all of the courses. In fact, the ranking position changes every year because it would actually depend on the availability of seats and also the performance of everyone in the exam.
Being in the top few hundred ranks is a good place to be in, especially for those from the General category, if you are targeting a safe seat. This ranking will vary and is subject to change with regard to your category and the number of seats allocated.

If you want the best idea, then look at cutoffs of the previous year or call the college directly. They'll be able to give you a better idea with respect to rank.