Note: The blue pages in the back of your book has a diagnostic test and several AP practice tests. My recommendation is you begin here.
Here are some free practice sites:
Following are some pay practice sites for AP Government:
Here is a link to chapter outlines for the 9th Edition. They are very similar to the text we are using.
Also, the following link is an example of government impact on policy, and specifically on education. It's an hour long, but for those of you choosing what to major on in school and where to go, you may find this interesting.