I'm giving it four stars because I already have extensive medical knowledge. Taking a certification course requires one to give
"textbook" answers and in this case, injured/ill people will not be textbook patients. I aced the course and some of the material in the book I found was misleading. It's not the wrong information, just different from what I would do. It was required for a course for my major, but eventually found that I didn't need it. It teaches basic CPR, wound treatments, poison, animal/insect/marine injures, etc. Lots of knowledge for someone looking to get basic treatment knowledge. I don't know if it can be used to study for the American Heart Associatons tests for CPR.