This is Gina Gallagher’s (of Shut Up About Your Perfect Kid fame) story of great success for her daughter in a specialty school: https://www.additudemag.com/adhd-schools-that-specialize-in-children-with-special-needs/. She recommends that school wholeheartedly.
I have a friend whose son goes to a twice-exceptional school in Los Angeles; I believe it’s Bridges Academy (http://www.bridges.edu/). She raves about it.
And here’s a high school started by parents of a child with learning difficulties: https://www.additudemag.com/adhd-school-chicago-special-needs-dyslexia/. If there’s a good middle school in the Chicago area, this could be the next step.
ADDitude Community Moderator, Author & Mentor on Parenting ADHD, Mom to teen w/ ADHD, LDs, and autism