Man... you really have it hard. First off, I’m sorry that you’re already so overwhelmed in year 10, but I can guarantee that if you learn how to manage your time well enough and be able to balance your social life as well as your academic one, you won’t feel as helpless anymore.
What happened with your friends? Our social environment and support system can usually affect our academic performance much greater than internal forces. I suggest you evaluate your chosen friends and confront and/or leave those who you really can’t be friends with instead of tiring yourself out.
If you’re terrible at revising, I suggest you find a friend and ask them how they revise or even look up at different revision methods. Maybe you havent found your method yet! I was in year 11 when I finally figured out that I prefer repeating my syllabus to myself before exams because it helps me remember more.
I can’t help with the school stuff, but remember this: you do have time. So much. Even if you mess up, there is always time (even if it’s just a week, a day, or even a few minutes, you still have it.) Also remember to be kind to yourself when stressed. Look up that thing about holding a glass of water and how it compares to stress.
Hope it gets better! Best of luck.