Hello Shivani,

For admission in bsc agriculture all the government colleges look for the 12th percentage of all the students. But there is also a entrance exam conducted by ICAR. If you can score good rank then you can get admission in any government college through out india based on your rank. In every govt college 15% seat is reserved for the students through ICAR. Minimum of 50%of marks is required in 12th for appearing in the exam.

Except for these there are several private colleges where you can get admission. They doesn't have a cutoff in 12th so. You can get get admission irrespective of you mark in 12th. 

Hope this helps. If you have any further queries please feel free to ask. We will be happy to help.