OP I know everyone here is telling you about how difficult it would be but no one seems to relate to you. I don’t have ADHD but I can relate. I have Generalized Anxiety Disorder. Now, I don’t know much about ADHD but my disorder I know it very well. It’s hard I am not going to lie but completely possible. Sometimes I study all day before a test and when I have to take the test my anxiety kicks in and is like a mental block. It’s frustrating knowing that the information is in your brain but you can’t access it. It also very hard to explain. But therapy has helped a lot. Now, I’m not in grad school but I am a mechanical engineering major an currently have a 4.0 gpa. Many people in engineering (without mental disorders) don’t have that gpa. My goal by saying this is not to boast but to tell you that everything is possible if you set your mind to it. Get the medical help you need and go for it.