I submitted evidence of past accommodations in a school setting (504/IEP), approval for accommodations on other standardized tests, a note indicating I am currently receiving accommodations (in college), and a medical note indicating my diagnosis.
I just received my accommodations for the LSAT. Although my situation is very different from yours, I would say that you definitely want someone qualified to give a diagnosis, indicate that you have a need for accommodations. I am pretty sure there …