That’s really step number one, and it might need to wait until school reopens. Without knowing the school’s PoV, nobody here can really advise you. All we have is the one-sided version that the school is unfair. In real life, calling a policy unfair is not generally the strongest argument. And it’s not like you have no AP classes; 4 is more than enough for most students.
As an FYI, it’s “fewer,” not “less.”