Bidhan Chandra Krishi Vishwavidyalaya, Nadia is one of the best colleges for agricultural courses. As the admission to BSc Agriculture programme is on the basis of marks obtained in 10+2, so the higher marks you get in secondary, higher the chances of getting admission.
Your overall percentage is pretty good. But 4 subjects are considered to prepare the merit list and those are English, Biology, Chemistry and Physics. So it depends how much you've got in these subjects.

Going by last few years' data, the cutoffs for OBC B candidates of WBCHSE board, lies around 85% marks while for other boards it is around 93%.
So based on your marks, you have chances that you may get admission in BCKV, if not Mohanpur, but other extended campuses.