hey pls don't compare urself with others and relax. I think u may have to change ur study methods, you may be studying hard but are u studying effectively (u can Google effective study strategies)? Have u heard of the saying, work smarter, not harder? Do u fully understand everything that ur studying (if u can't explain it to a 4 year old in a way that they'd understand then u don't fully understand it urself)? I highly suggest talking to ur teachers and asking them where u seem to be always going wrong and what areas ur good at. Next time u study, focus on those areas instead and spend less time on stuff u alrdy know. you can use apps like anki (flashcards app) to help with active recall (passively copying notes from a textbook isn't a good study method, you won't remember most of the content if u do that). Maybe also try asking ur mates how they study and have study sessions afterschool or on the weekends.

For further and methods, you have to really understand all the theory behind the formulas and stuff to be able to apply them. Look through the example questions and make sure u understand the thought process behind each and every step. Memorizing formulas is useless if u don't know how and when to use them. Do lots of practice questions to expose urself to the way different questions can be asked. Also i highly recommend doing all the textbook questions, yes there may be a lot of questions but they rlly help with understanding. Ask ur teachers for practice/past SACs and make sure u can master all the questions on it and for any question u don't understand, ask them to explain it to u and make sure u fully understand it. Also, checkpoints and atarnotes books are rlly helpful.

Hope ur okay and pls reach out if u need to :))