For what it's worth I'm a 25-year-old Australian who never encountered this specific syntax in schooling (it was always phrased "as <x> is to what?"), but am still very familiar with it from general interactions online.

It's probably just a matter of how strongly your immediate social circle feels about formal logic.

As one data point, we never did these sort of analogy puzzles in school in Finland (but we don't have standardized multiple-choice testing either). I'm only familiar with the concept and format as a part of the general anglosphere meme complex that you naturally get exposed to if you spend time on the internet.