Prior to written exam test dates, a 16-hour Refresher class is offered for mobile crane certifications. This two-day, very intensive class is only offered to members who are registered to take the CCO written exams. The fact that this class is termed a “refresher” implies that students already have had some training and experience necessary to pass the written exams. Because of the comprehensive nature of the CCO written exams, not all subjects will be covered in depth. People who need more training are encouraged to take the 40-hour Crane I class.