The civics and American history part is fine. But about 20 of the 60 questions were devoted to philosophy, microeconomics, and macroeconomics. You may think that these should be part of civics, but I don't think that is necessarily reasonable. I would certainly argue that philosophy and economics have had significant effects on how our government is shaped, but I would not think a citizen is lacking in his or her civic duties by knowing only American history and the design of our government. To be perfectly honest, I wouldn't expect 75% of Americans have a clue who St Thomas Aquinas is or what Keynesian economics is. I would expect them to be able to describe the more significant cases the Supreme Court has heard, how the Constitution is structured, what the Declaration of Independence says, what the major political alliances that the US has participated in were, and how the different wars that we have participated in were started and concluded.
I am not one to argue that civics and history are being successfully taught in our schools. In one memorable exchange with a nuclear mechanic on my old submarine I asked him the rough dates of when the Revolutionary War, the War of 1812, the Civil War, the Spanish American War, and World War II were fought. He got one right (I'll let you guess which one). Many of the dates he gave were off by more than a century. Sad. But he was still a good mechanic. These things were never taught to him in school and he never cared for them either way. But he could tell you how many turns per inch of lockwire you would need for some arbitrary sized nut or how to mechanically start up a turbine generator. If you think this is bad, most sailors I met couldn't tell me what happened at the Battle of Midway nor who Lord Nelson was! I should note that most of them had a decent knowledge in civics and history. There were some that were extremely knowledgeable in civics that could cite every battle in every war we fought, almost repeat lines of the Constitution verbatim, and describe the intricacies of many of the treaties we have signed (like SALT II). It is from talks with those sailors that I now know what I do about American history and the Constitution. But even they would have looked at me odd if I started asking who St. Thomas Aquinas or Alexis de Tocqueville was (except perhaps the officers who had courses in philosophy).