First of All, I passed the ASQ certified Green Belt exam several days. Here is a big appreciation to the Instructor. Regarding the course for passing the exam, it is a nice introduction to the Six Sigma in general. It gives you lots of concepts during the courses in a very understandable way. However, it would not replace your reading official handbook with official BOD. You need to read that book at least twice and make note for yourself in Word/Onenote which is very helpful for you to summarise things. It is also helpful for you to look up things during exam.