Speaking with Dr Grandin, she basically says she refuses to take excuses from anyone. If you have ADD/ADHD, autism, or anything else... her advise is to figure out what works for you, get help, anything but say I can't because I'm wired this way. Maybe you'll find you aren't great at math, but you excel in lit with certain coping strategies, she'd say you have found a calling. She's blunt and takes no excuses. She advises several students in animal Sci and she has had several with various disabilities. She has said in person and in lecture that there is no excuse to not try your best and to never give up.