I may be sound like a mother now, but, it It's for your good, I always be honest with you and with everyone
When I was at your age I also acted like u do, but u need to try to not be like that cuz when ure growing and growing u will find blocks of life and it will be hard to deal with

Try to take your school subjects seriously cuz next year's will be so difficult for you, I say this for you to have a good future
Your mom gets mad at you not for no reasons, she gets mad at u cuz of the things u don't wanna do for your life. As I always said, LIFE isn't something EASY to HANDLE when u grow up

My mother always said:
"If I'm mad at you it doesn't mean because I hate you, I get mad because I'm worried about your future and your actions you're taking"

Try to do things, not to be at the tablet all the whole day, think about it
I'm telling you this cuz I'm 18 and I had ur same way of thinking Sam