There are tests for each course. They will either be Competency Tests which measure a student's knowledge of the subject matter before they take the course, or, a Challenge Test or retake of the Certification Test.
A Challenge Test allows a student to try and pass-off the course without taking the course. A student will need to obtain a grade of 85% or higher to successfully "challenge" the course.
Any student who does not pass the initial Certification Test after taking the course may retake the Certification Test as many times as necessary to receive their Certification Certificate.