well, we're the same age but i'm in 11th grade so as a 'senior', i can tell you that my 10th grade was literal hell.
homework and exams and stress and lack of sleep and highschool drama and expectations all made me want to just leap off a cliff and never see this world again.. so i get how you feel, bby~
all i can say is.. be strong. also, don't let the stress get to you. sit in class and learn for the sole reason of getting new information; not for grades.
i know you have a set of amazing friends, so lean on them and talk to them if you feel stressed out.
eat chocolate and drink coffee~ they will save your life.
do NOT skip meals or sleep!
also, you're strong, ok? you'll get thru. i know you will.

The beginning of a new school year is always daunting, especially when you've been in the school system for so long and only have a couple of years left. I say take things week by week, get all of your homework and chores done before the evenings and definitely before the weekend. Then with all of the that spare time, you can relax, meditate and write, spazz out to music, etc. Just get stuff done early and you won't feel the stress or the pressure to get things done. / And ask for help./
I'm going into my second year of university soon and I have to say 10th grade was pretty easy. It was when I wrote on Aff the most. In the UK, that's the year we sit our GCSEs which is like 16-ish exams spread out over a couple of months. I sounds stressful but if you're prepared, its not hard at all.
TL;DR Try to enjoy yourself and make sure you don't leave things like revision to the last minute~

Whenever you find yourself stuck, just ask us all on here for help~

Omg you're so young, i know exactly how you feel. my anxiety was so bad when I was your age. it will get better trust me. Even tho I'm 18 I still feel like a wise old woman that should be offering comforting words. SHINee world will always be here for you x

When I started my junior year (September 2015), I literally broke down and thought I wouldn't make it to the end of the year, or even to thanksgiving. and now i'm starting my senior year. u can interpret that either optimistically or pessimistically, but just know that we're all here to help u thru the journey. we'll get through this together <3

Awe you're so young
I'm going into my first year of college so I'm imagining that's worse haha. Enjoy that time in your life, you'll make it through