sir ami class 12 a pori biology, chemistry, geography, and, nutrition a6a ami ki agriculture jata pari and amaka ki korta hoba
For admission in Bsc agriculture or BSc hons agriculture candidates should have passed 12th examination with PCB that means physics ,chemistry ,biology.
You have passed 12thclass with geography ,chemistry and biology. So there is no other way for admission in Bsc agriculture course until or unless you do you 12 th class PCB pass withs at least 50 to 60% marks + qualifying marks in entrance test that differs from one college to another.
Hope this helps.