This is why universities have offered what amount to remedial math classes for donkey's years. Even in the early 2000's, if you showed up to Calculus I without sufficient preparation, you'd find yourself bounced to Pre-Calculus by the end of the week.
In 2005 I had to take placement tests before I could even enroll in my classes, so someone who wasn't actually ready for Calculus wouldn't get to enroll in it if they didn't pass the placement tests.
