Let me be the bearer of good news for you.
There is only one exam that you need to take and it is called NCLEX-RN, a national exam. It is taken once and its results are accepted in every state in the US. State Boards, as they were known, no longer exist.
You only take the exam for one state by using the application called
"License by Examination" and for any other licenses that you want afterwards, you just use the application called "License by Endorsement."
As simple as that.............