There is nothing else to buy. Each course begins and ends with a test. The pre-test aids the instructor to determine what the student needs to study at the beginning of a course. The post-test provides the student and instructor with a method to validate the learning that has occurred. There is no schedule.
Students can work at their own pace.
The core course material is interactive, with self-grading components to each test and instructor scored components. The instructor, Dr. James Harned who is also the author of the courses, guides the student through the learning process. How long does it take to complete a course. Each course is designed to be completed in between 15 and 40 hours of consistent effort. However, many students choose to work at a slower pace.