APA Math (and beyond!)
Here is a book that was recommended to me by a student. I flipped through his copy and immediately bought my own. It is very easy to follow and very helpful. I have found that students who have (and use!) this book do very well in class and on tests. This is an excellent resource!
Disclaimer: It does not cover everything we learn in this class. It does not go in order of what we learn in this class. It also includes concepts you will learn in 7th and 8th grade. It will help you understand what we are doing in class and help prepare you for what's to come.
5th Grade STAAR (Does not apply to APA students!)
This is an excellent book to help prepare for the 5th Grade Math STAAR! The book contains a breakdown of the STAAR, the concepts tested, and a review of each concept. It also contains test-taking strategies, a study guide, practice questions, and the rationale behind why each answer is correct. I highly recommend this book!