When I was in high school decades ago, overt test prep was not part of normal high school courses – although it is likely that the weekly vocabulary words to learn and be quizzed on later in English courses were at least partially motivated by English teachers wanting to get students SAT scores up (the SAT verbal section at the time was mostly a vocabulary test).
Also, it was not the norm to do test prep beyond trying the sample questions in the test registration booklet. For achievement (now SAT subject) tests and AP tests, it was not typical to do much test prep beyond completing the associated course in high school.
Or (if any such exists any more) anyone who earned the same score without any test-specific prep at all?