Here are some of my favorite AP Statistics Exam Prep Books:
Honestly, any AP Stat prep book you can find is going to be helpful. The more practice you have, the better. These are just books that I have looked through specifically and think are VERY representative and helpful for the actual AP exam. :)
- 5 Steps to a 5 (2018 version / 2017 version)
This one is an overall great review book. It has a lot of great practice AP test questions & offers good explanation of topics. Books like these are great if you have specific topics that you need more help and practice with, because the book is divided into general topics (designing studies, probability, etc.) and has great "teaching" pages that explain a lot of the concepts to you.
- 5 Steps to a 5 - 500 AP Statistics Questions to Know by Test Day
This just has a bunch of questions. This is a great option for those of you who don't necessarily want to work on a specific topic, but want extra practice and a general review. I find this one most useful for last-minute review - you've studied everything, and just want to practice, practice, practice!
- Barron's AP Statistics
Another great option for topic-specific review. There are a bunch of practice AP exams, and good explanation of problems. Similiar to the 5 Steps to a 5 book (#1) , but just MORE of it (it's also a bit more expensive, especially if you buy it AT a store).