I'm just a beginner, but I have the first two course. At least for now, you have to take the level III and IV courses from Chunyi... or maybe one of his students.
If the AD/HD is you're own condition. I would believe that almost all of the benefit you need will come in time from the level I course work. Levels II, III, IV are more directed to techniques for healing others. You of course can use them on yourself.
My advice is to stick with the level I material. I'm confident you will progress towards your goal of health.
Sending love,
Iam2 
