I actually never bought the book. I used the conversion paper and practice exams that were set on ecampus. In my case, however, I asked many of the nurses on my floor to show me how to convert those equations because they used to have to do it and once I got through a few of the questions, I was able to convert just about all of the equations without any help. Basically like @Tea said, class is 4 hours long with the first hour being a review. Use that review to ask about those questions!!! It helped me to verify that the way the nurse taught me to convert was the same way Mr. Meyer converted the questions. After that, he gives you 3 hours to take the test. You can use your phone for the calculator or bring your own.