Came out of retirement after letting my certification lapse. Used the online module and workbook. Ending up focusing on use of the workbook exclusively (I'm old school hence the retirement) because for me I learn best in that manner. Plus it is essentially the same format when I attended this course 20 years ago. By the way, I passed. Get my results this week. Gives you complete understanding on how to take the test, understand question structure and narrow answers to 2 choices, and most importantly establishing confidence prior to taking the exam. I had 40 minutes to spare and did not have to rush through the questions I flagged at the end of the exam. When I hit the submit button, I knew I passed. Great product.