I bought this book a few years ago (I have since been hired and am an air traffic controller). The book gives you a vague idea at best of what you will see when you take the test. I would recommend checking sites like stuckmic as opposed to getting this book as they will have more and better information and you can post questions and participate in conversations in the forums if you like. It is also useful to follow the forums to find out when others who applied to your job posting are getting offer letters and such. Getting hired is quite a long ordeal so it's nice to know that you aren't the only one waiting months for the next phase of the hiring process.