My two youngest children have ADHD. Neither one has much patience for subjects that they don't find interesting.
My son is 2E -- GT with learning disability - in his case, he is dysgraphic (he has huge difficulty with handwriting so he takes all of his tests that require writing on computer and he doesn't have to fill in scantrons and he gets extended time on tests - that is mostly due to the ADHD). He is on a 6 year plan to get a degree. He started CC at 16 and has never taken more than 12 hours in a semester, often only 9 hours. He had one really bad semester, but has done well on the others. It took him awhile to get the hang of deadlines and juggling all that he had to do. Living at home and taking reduced hours helped him. He didn't know for the longest time what he wanted to major in. He tried a lot of different things and found them all wanting. Finally, last May I took him and his sister to do aptitude testing at
Aptitude Testing at the Johnson O'Connor Research Foundation. This was life altering for both of them and I highly recommend it. It doesn't just ask interests (they do ask this) but tests to find out what you are really good it. After the testing, DS changed his major to computer science. So far, he really likes it. And, it holds his interest which is really important for someone with ADHD. In his case, he has a strong desire for a 4 year degree and he enjoys learning new things in an academic sort of way so I think that is a good choice for him.
What I've had to realize is that no matter how smart he is (he graduated high school at 15), his ADHD does change some things for him. He isn't on the 4 year plan. His college plan is more meandering and slower. He is now a junior but has tons of extra courses that don't count for his degree. I've realized that his getting through college in 6 years is realistic for him.
My daughter also has ADHD. She is in many ways the opposite of the son I describe above. She isn't academically inclined. She doesn't like doing a lot of reading or writing. She doesn't like studying the kinds of things that she would have to study for a 4 year degree. She would hate a job that required her to do a lot of reading and writing.
We homeschooled her during high school so I knew well before she graduated that she had no interest in a 4 year degree. On the other hand, she certainly wanted to have training to do something beyond high school. We did a career planning course. I went an looked at the certificate and technical education offerings at several nearby community colleges. I avoided the for profit trade schools which are insanely expensive. In most instances, you can get the same training for a fraction of the cost at a community college. I then went down the list of programs with my daughter to see which ones interested her. She hates math/science, for example, so she rejected all the medical related courses (and there were a lot of them, many of which would be great for someone who does like science). Of the ones that were left, we then went and look at career prospects and read about what the career was really like. Through this, she ended up rejecting cooking as a career.
After doing all of this, she chose a field that she was interested in. In her case, it was administrative services, specifically office communications. She took one course last fall as a dual credit course, then started full time this semester. She is absolutely loving her courses. She is doing well academically. What is great for her is that most of her courses involve her doing stuff. She has one course, for example, that teaches her how to use PowerPoint. Most of the work is actually doing projects using PowerPoint. She loves that. She loves courses where she can do stuff. She doesn't find that boring and is very happy with it.
If her brother gets his C.S. degree he will probably make more money than she will. But - she would never get a C.S. degree. That isn't where her interests or talents are. However, with the courses she is taking she is learning skills that will help her to find a job. And, she enjoys what she is learning. Having a B.A. or B.S. is fine for those who talents lie in that directions. But, that isn't everyone.