The textbook is required for my upcoming EMT class, but the workbook is optional and it's $63, and I don't know much about it. Navigate Testprep and FISDAP are the two other things I was looking at as recommendations from another thread, and both are cheaper and seem like better options to study from and ace the NREMT test. Could someone who has used it give me an overview of the Aehlert workbook?