Yeah, I bought the Gleim book online along with a practice CD. It allows you to answer questions and it will tell you immediately if you got it right or wrong and why. It also allows you to take a practice tests in either the Lasergrade or the CATS format. I dont want to come across as lazy but I think if I could save myself the trouble of having to worry about an additional 300 questions (difference between 121 and 135), I would like to take it. It would be just more questions I would not have to worry about messing up on.