Dude that is DEEP...
Well, one day, something could happen, and we wouldn't have access to the internet. You need to be able to know certain things- algebra is actually quite helpful. Although, school doesn't teach most of the things we NEED to know- like how to farm and first aid. Those are the things you could end up really needing the most one day, but all you really know is the difference between a verb and an adverb :/ Somethings however, like biology, could help though!
You also need school to function in society.