Tell your gym teacher to lick your balls, you're here to play football!
You have to be in class and I don't know what you would do if you weren't participating. Don't work hard that day and if you have to record numbers or something, just fudge em. The day after the game, Fri., you'd be well served to do some light sets of 20-25 reps to kickstart your recovery.
Oh, and if you aren't starting, you'd better be lifting hard on game day so you can start one day!
What county in Maryland do you play in? I played in Montgomery County.