Private schools are required to comply with IEP also. And, they are your best bet. For those in public school they have a holdback rule typically requiring a child to be held back two grades before they provide special ed.
Private schools don’t have to follow an IEP. For example, my daughter needed speech therapy. The private school did not have to provide that.
The public school was required to provide therapy, but we disagreed on type and amount.
Even after we got an independent evaluation at district expense and used the providers the school district picked out, they still would not provide treatments based on those evaluations.
The independent neuropsychologist said it was the worst IEP she had ever been in.
I wanted to move, but my husband didn’t. We opted for private school with a pull out program for reading and then private speech therapy after school.
It was expensive and so much work!