If you want to learn more about ADHD there's a intresting book about it called "ADHD doesn't exist" which relates over 40 years in the matter by a specialist of the field. The author explains that ADHD is too often treated as the problem itself when it's "just" symptoms. He also takes time to explain every source he's observed to cause there symptoms, how he looks for them with daily patients and what to do/how to deal with these problems properly. I learnt a lot about myself and what could realy be the cause of my ADHD reading it.