Definitely pursue an IEP right away. They need to see an official diagnosis so they will treat him like a kid with a disability, instead of like a defiant neurotypical who “knows better.”
This article outlines the process. Make sure you submit his diagnosis report with it:
And deliver a letter to the school stating that he is allowed to walk to his aunt’s house OR ride the bus. They’re responsible for him and his safety. Without your official permission, they need to know where he is all the time.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism