Actual classes at a University? Or college classes via distance learning? Because CA did not allow me to take the test before 16 and the colleges would not take me. This was in 88. 16 was the soonest (we tried before) I could start at a college in CA.
So....When a psychologist gave them an I Q test they scored in the 98% in mathematics. That was their ticket to get them into the community college. Once they had a certain number of community college credits the state university ( by law) were required to accept them.