Hello Student

If your OBC NCL certificate is included in Central list then this certificate is valid for in every state throughout India weather it is used for education or for jobs and placement. As your permanent address is in Bihar and now due to education purpose you are in the state of West Bengal then this state is not Be your permanent address of you so this criteria will not face  any problem or we will create  any problem regarding your education ahead and employment. Your permanent address of Bihar will be retained in filling up of any kind of form regarding education and employment.

Hope this will help.