Annoying Situation Before Spring Break

The other classes idgaf about as much but what bothers me lately is my grade being a C- for quite literally no reason in my history class. My teacher for that class is genuinely the worst at organizing her grades. She keeps losing my assignments then blaming me and embarrassing me for asking about it. I genuinely got so pissed I got up and left class yesterday over this. My mom yelled at me this morning saying I can't miss school over this and that she will talk to my teacher and the principal but I don't know why I have to sit at school and get bullied by my teacher if she's not gonna do it til she has time. She also threatened to ground me for not listening to her this morning, but who the fuck wants to go to school after being treated that way. I technically have 6 periods but only 4 classes and she's the teacher for two of those classes. I'm in my 1st-3rd period writing this with anger. I hate my mom and I hate my stupid ass teacher.