Why do the public schools will placed a high functioning autistic student in a class with mentally handicapped students?

there are two types of special ed settings. firstly, there is a special ed classes for those who higher functioning and secondly, there is also a special ed classes for those who are moderate and severe students with mental hanicapped. in middle school i was with the higher functioning classes. now in since I went to High School they placed me into a small class for those who don't know any better. is it wrong in all levels to placed someone who has High functioning autism to put into a lower functioning class. I felt i was robbed from getting a better education.

Why do the public schools will placed a high functioning autistic student in a class with mentally handicapped students?
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