I’m mildly ADD. The thing is, I think we just think differently. We also have an ability to hyperfocus on subjects we like - if you tap into that you can get a crazy amount done.
It comes down to using techniques that work with the way you think, instead of using the techniques that work for other people as if they should work for everybody. They don’t. And it’s wrong for them (school etc) to criticise and stigmatise as if we should, but they do so we have to adapt and cope.
For me that means lots of information at a fast enough pace to keep me interested. Boredom is the enemy.
I don’t do zen, no clearing the mind, I do walking, moving meditations, running meditation, and other meditations that need you to think and have an active mind.
I speed up youtubes so they talk fast enough that I don’t get frustrated and start looking for distractions. Learn to speed read and read in very small chunks - 3 pages or a short chapter at a time then go do something with that, do something else or go to a different book. Keep moving, all the time, spiral though activities and switch as soon as your mind leaps to something else. It’s very easy to piece it all together afterwards so there’s no issue with doing things out of order or mixed up. Getting the information is the main thing, not getting it in the order someone else provided.