Make sure he knows whose homework it is! https://www.quora.com/How-do-you-help-a-7-year-old-with-ADHD-focus-on-homework-after-the-days-medication-has-worn-off/answer/Sarah-Cheyette-MD …
Sleep or ADHD?
Sometimes it's both: https://www.quora.com/How-do-I-know-if-my-inability-to-focus-is-due-to-ADHD-a-lack-of-sleep-or-neither/answer/Sarah-Cheyette-MD …
Thinking with Focus
How do you define yourself? Hopefully not by your ADHD: https://www.psychologytoday.com/blog/1-2-3-adhd/201709/thinking-focus …