We've included questions throughout this course to help you practice the skills and information you'll need for the multiple choice portion of your exam.
Each time you answer a question, we show you the correct answer, along with rationales to check your understanding.
After you try a question, our rationales help you understand why the correct answer is the best option.
We have three varieties of practice: exercises, quizzes, and unit tests.


You can practice your understanding of the concepts in individual lessons by using our exercises.


You can practice your understanding across many lessons in our quizzes, which draw on questions from previous lessons.

Unit tests

You can practice your understanding of an entire unit by taking our unit tests, found at the bottom of each unit page. Unit tests sample from questions across the lessons in that unit.