I would get your parents involved and have them go to the director of guidance and further up the chain of command as necessary. Going from 11 AP’s jr/sr year to 10 AP’s does not, IMO, warrant a reduction from “most rigorous.” I can’t imagine that a college AO would not call into question the rationale/sanity/competence of a HS GC on this.
The prevailing wisdom is that 6-8 AP’s or AP-equivalent courses for the entire HS career is “most rigorous” and that any further AP courses will not add anything meaningful to the college application.