Look, I understand you may not understand what it is like having ADHD, but your post came off incredibly dismissive. Telling a person with ADHD to "just focus" can be like telling a person in a wheelchair to "go for a run": it is incredibly frustrating to hear and can be nearly impossible. This may be a hard concept for you to get your head around, but this is a real problem for some people and medication is a real(and often necessary) solution to a real problem.