I would assume that not doing any of the work and just taking tests is not an option the school will accept. Grades are NOT the qualifying factor for a 504 plan — the school needs to be educated on that. Go to the Director of Special Ed at your school board if the school hangs onto that misbelief — it’s their job to make sure all the schools in their area are following the law.
It sounds like he might be bored or the work is too easy for him. OR, it could be that he’s struggling with the work or managing himself on his own in the classroom.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism