Don't know if this info helps at all (from what you described it sounds a bit like an Intellectual Impairment to me but I am not qualified to make diagnosis at all so don't quote me on that) but there is a link to info about Intellectual Impairment. If you look down the side menu there is also a list of other disabilities that you can have a look at. There are strategies for managing them outlined.

Intellectual Impairment - Teaching and Learning

This is an Ed Qld document so the specific procedure stuff won't apply to your situation but the info about the different disabilities will.

Hope that helps . . .