they teach you it in high school, you can’t graduate without passing a test where that’s like the main question
In IL you have to pass the constitution test both to get into and to graduate high school. If I recall correctly, the 8th grade test was an IL requirement, but the requirement to pass it again in high school was a national requirement. The iorny being that they mandated that you take a test proving that you understand that they don't have the legal authority to mandate that you take that test.