Damn that's a crazy system. Over here colleges have maths prep courses for those whose maths skills are insufficient (or, like, older folks getting back into learning), and there are typically no admission requirements beyond having graduated HS (with some exceptions like medicine).
> Damn that's a crazy system.
The real craziness is in K-12 education itself. Colleges have just evolved their own "system" to cope with that in the most practicable way while preserving the world-class standards they care about. (Gen-ed college courses is another example. In most of the world, providing 'gen-ed' is the job of high school!)