I found this book to be of very limited usefulness, which makes me glad that I borrowed it from the library and saved myself some money.

There are many sample test questions of the type that you may see on the FAA written exam. However, many of the test questions have accompanying figures, which are missing from this book. That makes many of the sample questions that this book contains completely useless. You can't determine the distance between two airports on a sectional chart without having a copy of the sectional chart. You can't determine Vne if there isn't an airspeed indicator pictured. You get the idea. (Note: there is an Airman Knowledge Testing Supplement that you need to accompany this book, otherwise the test prep books are totally useless. Thankfully, you can find PDF copies on the FAA website, as they are official FAA handbooks.)

The book also contains all private pilot questions, which includes airplane, glider, balloon, rotorcraft, etc. There are acronyms above each of the questions to help guide your study, but I found that when I was in "super focused study mode" I would gloss over that and get to questions that made no sense, and it would interrupt the flow of my study.

I recommend taking the money that you would have spent on this book and instead purchasing an app like the one that Dauntless Aviation makes, which gives you access to questions which (a) are more specific to the certificate that you are going for (b) actually contain the figures along with the questions and (c) provides a lot more feedback on all of the questions. ( )