My kid with ASD/Asperger's already had an IEP and was getting a lot of supports, services and accommodations at school: 20 hrs a wk of Sp Ed support and 8 hrs a month of speech therapy for pragmatic speech, behavioral support, and OT in a general education inclusive classroom in 2nd grade.
But when DS was diagnosed with ADHD and started meds, it was still miraculous. His life at school improved dramatically and we have a much happier kid who loves school and has a group of friends.