To become a Certified Nursing Assistant (CNA) and be listed on the Wisconsin Nurse Aide Registry, you must also pass a knowledge and skills competency exam. The cost of this exam is $125. This fee is in addition to your course fee and is not funded by your high school. Further information about the exam will be given to you by your instructor throughout class. For additional information, please refer to the Headmaster Candidate Handbook provided to you on the first day of class.