The plans you are referring to (which from the fairly loose description could be either IEPs or 504s) are a matter of conpliance with federal law, specifically (for IEPs) the Individuals with Disabilities Education Act of 2004 and (for 504s) the Rehabilitation Act of 1973, not something particular to California. And plenty of students who have either are, in fact, exceptionally bright, because both have standards that are not simply the absence of brightness.