Actually, in Georgia there is a test required each year on rule changes. And every coach HAS to score 100. Failure to do so is a $100 fine.
We used to have to attend a rules clinic, and then take a test online. It was the exact same clinic required of officials. It is on the rule CHANGES, POEs and new administrative issues, not the whole rule book.
Now the state produces an online video. You watch a 5-10 minute section, and answer 4 questions. If you miss any question (and it doesn't tell you which one you missed), you have to watch that section all over again or you can't advance Repeat until you get all the questions correct, then you can go to the next section. You only get to the end, (and get credit) if you answer every question correctly, a total of 30-40 questions. The whole process takes anywhere from 40-60 minutes depending on the number and complexity of the rule changes that year. The window for taking the test is about 2 weeks. Any coach not completing it is fined $100. Rarely will the school pay the fine for you.
The test is required of all high school coaches, head coaches and assistants, Varsity, JV or Freshmen. They way they check is they cross the list of those completing the test with the list of coaches getting their GHSA pass (which is like gold, it lets you and a guest into any GHSA event, anytime, anywhere).
As for a test on the whole rule book, I would have no problem requiring that of coaches. But any official that scores lower than the highest coach is out of a job!