There's nothing that can justify this kind of behavior; however I see this, in a way, as a monetized form of gaming the system the way some people game the Americans with Disabilities Act to gain advantage. With the right doctor and the right diagnosis, one can get additional time to take the SAT/ACT, GRE, GMAT, LSAT, Bar Exam, Medical Boards and many other exams.
The system is rapidly degrading into a contest to see whom can claim the most disadvantaged state to get the most benefits.