turn off your wifi router and say you had no internet for that time. But it had to be turn off for a few more hours to make it believable. You'll be able to fool your parents as well. reply
Get your parents phone/laptop and email your teachers saying that you're gonna be absent for gym class cuz you getting tested for corona or smth. I did that once for skipping math, and it worked pretty well. Might do it again. reply