You can learn from practice book answers by completing the exercises in the book and using the answers to check your accuracy. Answers in the form of completed exercises also serve as examples of the proper way to conduct the task at hand.
A practice book is a study tool a person can use independently. A practice book typically provides a primer on its subject, practice exercises, and answers in the back of the book. Practice books frequently cover preparation for standardized tests, such as the SAT, ACT and GRE. Test preparation practice books usually also include information and tips about the exam.
A basic strategy for utilizing a practice book is to take an initial practice test at the start of your studies to see where you stand in the subject. The initial practice test can also help you see which areas you most need to work on. After spending several weeks studying the material, re-take the test to see if you have improved. Repeat this process until you've mastered the material, at which point you can move on to a practice book covering the next level of the subject you're studying. Another option is to form a study group and have members quiz one another on the book's materials.