Hello Aspirant,

See if your caste BC-2 comes under central list of OBC category of your state then only you can get reservation benefit of OBC category on central level but for state level you won't get OBC reservation because you are already having BC-2 reservation sub-category which belongs to OBC category.

Now if you have also not got BC-2 reservation advantage in Bihar then there might be some reasons, like you may have not submitted the proper documents to claim your reservation or there might be some official errors, so you have to ask from your local authorities regarding this.

I hope this information helps you.

Good Luck!!