The Intercollegiate Studies Institute has an online American civics exam. The Institute reports,
The average score for all 2,508 Americans taking the following test was 49%; college educators scored 55%. Can you do better? Questions were drawn from past ISI surveys, as well as other nationally recognized exams.Give it a try - no cheating! No Googling answers or "phone a friend." All questions are multiple choice. Here is my score (yes, I did take the test honestly); click image for larger view:
I missed the last question.