Yes... something like a civics exam would be a really good thing... however, I guess that does disadvantage some people who might not have the time to actually attend the exam (yes, I know it could be done over the internet... but even then... people procrastinate if they don't find it important...).

Interestingly enough... often it is new migrants who will know more about a country than the people who had to grow up there... mostly due to the civics knowledge requirement of becoming a citizen.