Sometimes, exceptions should be made.

I get that making too many exceptions for too many people leads to watering down standards.  Believe me, as a college instructor, I get that. 

However. 

It goes beyond keeping standards high--honestly, veering toward the stupidity demonstrated by zero tolerance policies toward disposable plastic knives in kindergarten lunchboxes--to require someone with a legitimate disability who passes every test but one with very high scores to pass them all before allowing him to graduate.  Especially when that disability attacks him in just a couple areas.  Usually with autism, those high scores in one or two areas are very high scores, and the young man in question might be able to pass the math test, but it's doubtful it'll be with more than a bare minimum, if he can pass it at all.