My only complaint was that I was not able to be told which questions I answered wrong on the quizzes, so that I could go back and review the material in order to learn from my mistakes. I didn't need to be told the correct answer, but to know which questions were answered wrong would have been useful. Some of the material in the online course seemed to be presented in a slightly different manner from the book. As I did the main test, I was unable to find exact answers in the book, to match the question being asked. A complete re-write of the book and the online course so that they are both congruent would be my suggestion.