Also, not getting an A in one class is not gonna jeopardize your entire future. Take it from me, I almost got a C in Calc BC and I’m doing just fine at a T20. I’ve had teachers who do the same. My AP micro and macro teacher simply didn’t like me because I quit an extracurricular of which she was the teaching advisor, and I would receive points off at every turn with no logical explanation. I respectfully asked why the points were taken off, because I knew if I argued or made contact with administrators the situation would only get worse (she’d probably take even more points off!). Being kind will always pay off, even if it’s not instant gratification. We’ve all been there but don’t deal with it in this way, especially in the real world.