Helped me pass, but it could've been thinner. Maybe replace (or narrow down) some of the personal/real-world examples with more exercises regarding code coverage on code snippets, on chapter two. Those provide enough damage to everyone. Chapter 3, 4, 5, 6 were well explained, I got over 80% on all of those solely with the help of this book. But chapter two was an utter confusion and organized like it was a university course, and you had enough time to go through stuff with stories and all that. But, Rex and Jamie, the truth is, most people pick up this book one week before their exams at most.