Magruder's Quizzes
Here are a bunch of quizzes you can take that go with the Magruder's textbook. It's not every chapter, but it was made up by a teacher and does give one answers.

1. Federalism (Ch 1-4) & Principles of Government
2. Executive Branch (Ch 13-17)
3. Judicial Branch (Ch 18-21) & another one
4. State and Local Government