If you are familiar with a particular subject or are able to master content without assistance, you may be able to earn credit through a single comprehensive examination that comprises Course Credit by Examination. You receive a course syllabus that outlines course requirements, grading policy, and the kind of examination to be taken; obtain the textbook; and prepare for the examination without assistance from an instructor. Sample exam questions for many of the courses are included in the syllabus students get upon enollment. You may enroll at any time, but you must take the examination within six months. Your grade on the examination becomes your grade for the course.