Quite a few of those queries weren't even known by kids, who went to school in the 1920s through the early '60s, when such things WERE actually being routinely taught, until they were in high school.
My grandparents were taught algebra and geometry in the 7th and 8th grade; however, by the time I was in school, even elite private schools were NOT teaching algebra and geometry until high school!
OTOH...my progeny got algebra ( but NOT geometry ), in a very elite private day school.
And now their progeny are getting sort of algebra and geometry, in a private day lower & middle school; however, classic lit is no longer being required reading in any lower nor middle school, that I know of, to the extent it once was,so the English section of this article is also ridiculous because it doesn't have age groupings.
The history part is also all over the place! The ENLIGHTENMENT? In what grades? That wasn't EVER taught in lower grades, in this nation. But some of the other stuff was and still is.
I knew a lady who was born in the 1890’s and who had passed the entrance exam to attend a RURAL (very rural) Pennsylvania High School in the 1910’s.
She had four years of French, four years of Latin, four years of German, and three years of Greek.