Replying to Gym class.....

hey NS.....im a sophomore in high school and this semester i have been taking gym class because it is a requirement to take 2 years before graduating. And after finishing 3rd quarter with gym we moved into health. Our gym teacher assigned partners...we chose our topic and he said when we got back from april vacation he would pick who would go first the day AFTER getting back to school. So me and my partners did most of it over vaca and came into school thinking we had one more day to finish it......but we dont! it turns out when we get back he makes up pick who goes first and we got first. so we thought....ok we'll be ready by tomorrow...and apparently he says we have to go TODAY. so were not ready our ppt is terrible and we basically fail. my group and I finds this completely unfair and go to our guidance counselor because our gym teacher is a lying fuck and is completely unfair. we also talked to the principle and they both did NOTHING about it. I am an a-b student and i am getting an F in gym class because my teacher is a lying fuck. is there anyway to like drop a gym grade and retake gym my junior year because its bull shit. Does anyone have any advice? +K.....haha srry to vent my problem but i really don't know what to do and i don't want to tell my parents yet unless i can't do anything else to prevent it.