That burns me up! This is clearly part of executive functioning deficits, which is part of ADHD. You could put a note on his desk that says, “Do you have your agenda? Go get it!” That could work for him, or he could not really notice or process it. (Wouldn’t work for my son.) The teacher needs to remind him when needed and not punish him when he forgets, since it’s clearly part of his disorder.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism