I would expect a professor of mathematics to get at least a few wrong because of awful phrasing and gotchas.

An 8th Grader might pass it. But I would probably fail without serious preparation because I haven't solved an algebra equation, used trig, or done any real math by hand in 20 years.

Disuse is not incompetence.

Now, they could make every history/language/music teacher try to relearn all these things in order to pass the test and forget it all again, but it's hard to believe it's not a big waste of everyone's time and energy.

Perhaps we expect too little of people, but there's nothing wrong with specialization.