The registry states that students enrolled in a nursing program have the option to challenge the nursing assistant test In Tennessee as long as they show successful completion of the basic nursing fundamentals coursework and clinical experiences. Contact the Tennessee Nurse Aide Registry at (615) 532-5171 and ask if you might qualify in your current situation, even though you are not currently enrolled in a LPN or RN program. You may also call Headmaster, the company in charge of administering the CNA exam at (877) 201-0758.