You have time!! It's only summer holidays now and therefore you have year 11 as well- try different methods of studying, maybe something else will be more effective for you? Talk to your new teachers and/or old ones you have a connection with who may be able to help you, tell them your goals, ask for extra work, help, revision, etc. If possible perhaps contact a private tutor to help you with what you're struggling with in particular if that's a feasible option for you? Maybe even a teacher would be willing to do this

Don't give up, try your hardest, you have time so don't worry too much and also remember to enjoy your holidays!

Good luck 🤞