I didn’t have accommodations for the MCAT specifically, so don’t have advice on that front, unfortunately. However, wanted to say that if you did get them, USE THEM. It is nearly impossible to get accommodations on your medical licensing exams if you do have a record of having a disability and accommodations but didn’t utilize them on past standardized exams.
Sorry I don’t have an answer for your question though! Just wanted to throw out the above so you were aware. If you are disabled and have accommodations that were approved by the testing company, I anticipate it would improve your score. But that’s just my $0.02.
Hit me up if you have any specific questions that I might be able to field.