I'm sure it does. My wife (deceased ten years now) had ADD as well as schizophrenia and extreme anxiety and her writing was atrocious and she was raised by foster families. However, I could still communicate with her via TDD, and I did not think any less of her for it. She had a rough time in school, of course, and I did not blame her. ADD surely interferes with studies, seems a no-brainer.
