No, you don't have to take an exam at the end of the course to receive credit. Instead, you will be graded on "Learning Assessments" that you take throughout the course. "Learning Assessments" are typically 3-4 multiple choice questions based on a case study or chapter. At the end of the course, you will complete a feedback survey. When you have completed the survey, you can download your course certificate and receive credit.
For more information on how to take a course, please follow this link: How do I take a course?