I am diagnosed with ADHD and I can work fine at school or my job (busing at a cafe). The thing is when I do school work I can be easily distracted by the internet, especially with work that involves using a computer. When I write papers, use on-line data bases for research I find my self constantly looking at facebook, slap etc. yet when I am in a quite space and am just reading or doing something without a computer I am fine. Although I still have to turn my phone on silent and put it away because a text/call can distract me. At work its fine cause I work in a face paced job. I have no problems with organizing, managing time etc.
I really feel that ADD and ADHD are blown out of proportion. Yes some people are really hyper active and need medication but in this day and age I know so many people who will cram when it comes time to study and will just pile up a shit ton of school work before its due, pop an adderall and pull an all nighter.
A lot of time people really just need a different environment to get things done. My roommate can study and read with loud music in his room yet I can't get down like that. Everyone has a different method of working effectively.