ADHD or not, diagnosis is not where the problem should begin to be treated.
I was diagnosed with ADD four months ago and this is in my late teens.
Now in the middle of college, I finally understand responsibility. This sudden jump still scares and depresses me. Now I require a change in all manners, academics, personal goals, habits. I still have difficulty learning through reading and listening. Maybe 30 min on a few pages of an uninteresting book. But I have no problem reasoning on my own (probably my best hyper focus) and multi-tasking on a job. In fact, if someone doesn't remind me to stop working, I won't and put myself in harm's way.
This whole time, I had no parental support (Asian parents stereotypes are true in a way) and was left with a conditioning of always being obedient to others. They even prevented me from trying to see a psychiatrist pre-18.
For me, a whole life had gone by that I didn't understand. And I realize how many kids "live in the moment" and fail to recognize the severities of their futures. Shouldn't it be apparent that suicide is a leading cause of death in adolescents? It's even more difficult for ADHD people. It's not a diagnosis or medication that they need, it's a change in lifestyle, especially in parenting.
This is not targeted to Asian parents only. Way too many kids are given freedom of their own accord. Almost all teachers post HW online now and the students are left to control their addictions to themselves which WILL result in their failure.
Case 1: A close cousin. Oblivious to social understandings and has a temper. Doesn't do work and is hooked on video games.
Parents yell at him and he can't talk back.
Case 2: A cousin that is hyperactive around friends. Competitive and arrogant. Parents love him too much to discipline him.
These are two different ends on the spectrum of bad parenting. Adults need to learn that they are guiding the next generation. Parenting is not about spoiling or providing needs, it is to make life easy. Connecting with the thing that you brought into this world, easy.