Rudder, as of my last experience, few visa application to come to US for NCLEX-RN has been rejected. The consular suggests to go to Hong Kong or India. If one can come to US on B2 for other purpose that will be good. If you need specific advice you can email to me. (Disclaimer: I am neither a law professonal nor a healthcare profesional. My only interest in providing such information is to make people aware of problems and prospects of nurse immigration.)