AP Comparative Government Advice?

I’m currently interested in self-studying for the AP Comparative Government exam. I keep hearing about this Ethel Wood book that is highly recommended, but does anyone know if it’s actually sufficient for self-studying for the AP exam? The Ethel Wood book does seem like more of a textbook to me than a study guide. Does anyone have any general advice in getting a 5 on this exam or would like to share personal experiences with it? Any input is appreciated! Thanks : )