So I got the book and the CD.
There are 100 questions and answers in the book...
Is that all I need to study? Will there be questions from outside these?
The only external information you'll need are the answers that are specific to your state or district, e.g. who is your state's governor or who is your representative in the House.
I actually believe USCIS never have asked these questions and I can understand the reason: they themselves don't know.