We had thought about bipolar a few years ago. After some time, it seemed his moods would change due to predictable OE reasons.

I am very happy with his school's,efforts in keeping him adequately challenged and accomodating. There is a small population of 2e students in his class. We had him on two separate intervention plans. One for the past two years. The gist of it is that he has to start advocating for his needs as well as attend an end of sclass day study period to check on his assignment progress, grades. Timelines, and ask for clarification or tutorials. He is allowed to retake failing exams if he requests so in a timely manner.

As far as behavior, I am really leaning towards his sensory issues. Light, sound and touch does irritate him.