Honestly, he's struggled with it at times. But he does a lot better when he goes back to creating positive self-reinforcement for why he wants to accomplish the goals that he has set for himself. He's now doing fairly well in college. He wants to experience more of the world, and to that end will be a transfer student to Beijing next semester
For ADD/ADHD it is easy to go off the rails. But if the stereotype of asian discipline and expectations of overachievement holds, than that surrounding might offset the possible distracting experience of an uncommon environment I guess.