NKU Testing Services is an authorized test center for Castle Worldwide. Castle Woldwide provides examination delivery, design, and development services to certification and licensure organizations, government agencies, corporations, educational institutions, and trade and professional associations.


Castle's mission is to provide you with a safe, secure,

comfortable, and convenient testing experience.


If you need assistance with candidate services including scheduling, testing, or reporting, please feel free to contact a customer service representative by telephone at 1.919.572.6880.

Please contact your test sponsor for more information. You may also visit the Castle Worldwide Testing website for testing tutorials and to purchase practice exams.