Things I do that's a waste of time

I thinkthere is a couple of things I do thats a waste of time . I think one of the things I do thats a waste of time is just sit around and texting for a long period of time. Another thing I feel like is a waste of time is that in high school they teach us all this stuff and I feel like half the stuff they teach us is going to go out the window , I mean like we learn stuff then we constantly keep learning something new every single day then once we have exams or a test we can't reemeber half the stuff we learned and our techers gives us packets to help us remeber ugh thats so annoying ! Like i understand that you would have to use some of the stuff later on in life but not everything so why do they make us go through all of this stuff if were not going to remember half of it i feel like some of the stuff they teach us is a waste of time and energy and could be spent on something that we know we could use later on in the future whoen were adults and need to live for ourselves.