Re-take the primary or intermediate exam. If you want to have a primary certificate after the expiration of the primary outdoor instructor certificate, you can only get the primary certificate again, or you can participate in the training and study of the intermediate outdoor instructor, and then get the intermediate outdoor instructor certificate through internship and submission of reports. To participate in the national vocational qualification outdoor teacher training class, as for becoming a formal teacher, you need to practice and attend classes. Generally, it takes at least five or six years to grow from a junior outdoor coach to an outdoor teacher.