Fair enough. What I was trying to address is the approach where people try to learn all the questions and their answers by rote, and that would not be a good strategy.(bolding mine, which I disagree with a little bit)
I didn't read the book. I took the practice tests and if I didn't know a question, I would refer to the book for the answer. There are 10 practice tests, which I went through about 3-4 times. Many of the facts presented in the questions were similar enough to the ones on the test that it did help with the learning of the material.
(And people who've not had North-American history, politics, and geography as the focus during their school years may benefit from some of the background/context the book offers)