I was getting A's on my tests without this book but decided to get it half-way through my course. I still get A's. What's the difference? I study much more efficiently and I'm able to save a lot of time. Why? The answer book helps you to remember the big topics and focus on thinking in a way that makes everything stick effectively. You can learn a lot from the book by just studying it on your own and drawing or however else you learn, but learning in this test-taking method is fantastic and it allows you to grasp what you really should be understanding out of each chapter. The only downside is flipping so far between questions and answers. get some sticky tabs to quickly alleviate this issue.