Certified nursing assistants must be able to pass a series of tests while in school. These classes are often taken online by those wishing to enter this field. The tests are conducted online as well, and students will have to demonstrate knowledge of medical terms, how to handle certain emergencies, the details of patient's rights, and first aid techniques. Certification requires the passing of final exams as well as a certain amount of course credits. Practice exams are offered online by a number of reputable medical associations. The certification test itself must be applied for in advance, and students are encouraged to practice an online test beforehand.