The Feds updated their ADA documentation guidelines in early 2016 with respect to specific diagnoses, with the key part being that they say that if a student has been receiving accommodations in school under IDEA or 504, the testing agency should generally accept this documentation without requiring additional testing, and provide the same accommodations (if appropriate- such as, e.g., time an a half or quiet room). Read it carefully though, as it looks like the individual agencies or schools are not bound by this- it sounds permissive, and suggestive, but stops short of being a requirement. It “encourages” the schools/agencies to accept the previous documentation if sufficient and if the accommodations are in place and used. http://www.dyslexicadvantage.org/dyslexia-and-accommodations-new-ada-guidelines-2016-for-school-and-work/