What to say over my parents over grades? ?

At my school you can see what grades we get on the school website. Everything on the page is either an A, B, and only a few C's. There's 40-50 ignments on the page, and only maybe 2 F's. One of those was getting something like 3 questions wrong out of 6. The other was getting 9 things wrong, but it was on something I will never get, that being Fractions. I try to do well and my best, but they say I'm not even trying. How are they supposed to know? I never misbehave or anything. I believe I got another F on something, and it was social studies project. First of all, I find every subject but math a complete waste of my time. Secondly, the project my social studies teacher igns are designed so that you either have to be someone who spends days on a project or you have to have your mom do the project for you. Last time I checked, having your mother do everything for you won't help you at all in the real world. I balance everything well, too. I play sports, breakdance, and play video games in my free time. All these pointless subjects are not my first priority. I need help on what to say next time I have to talk to my parents about this. We have argued for several hours total, and I need a point that will let him compromise.