Hi,

OBC category list of Centre is different from that of the state. There are 3 sub-categories that fall under 3B categories.

3B:

1) 3 BG category is 3B-General category

2) 3 BK category is 3B-Karnataka category. This is consider as in OBC category in Karnataka state.

3) 3 BR category is 3B-Rural category.

I hope you have understood. For further clarity, please refer to your caste certificate & check the rules of the state you are living in. Centre has a different OBC category list.