Remember that in America, one can study on one’s own, and then take the SAT, CLEP, AP exams, and go to a university.
Let’s be realistic here. To prepare for even one of those exams takes a decent amount of time and practice – when supplemented to the regular curriculum it is intended for. To study for them without the basic knowledge they test on would be enormously time consuming and stressful – time that would be better spent distributed over the course of a regular curriculum, if only for the sake of the test-taker’s mental health.
Unless you presuppose that all Jewish students are incredibly gifted geniuses with great emotional resilience. Then fine.