Just to be clear: I am not unsympathetic to the Math II teacher. Just as there is no royal road to geometry, there is no athletic exemption based on the math that one might have learned, had one been in class and not at a track meet.
At my university, faculty are only required to keep final exams for one year after a course has ended. I might start holding them longer. Several of my colleagues do not like the university-required make-up opportunities, for varsity athletes, though they honor them.