I'm in year 11 so I don't know how willingly you will take advice from me but anyway- maybe try studying in a different location, might help especially if your current study spot has distractions. And when you know you need to study but don't feel like it, try just studying for 25 minutes, do the easy stuff, and then after those 25 minutes take a 5 minute break and then try moving on to the more important/difficult stuff. Continue studying in 25 minute intervals with 5 minute breaks in between. This is called the pomodoro technique (maybe you've heard of it) and I find it really works for me! It might help motivate you or maybe not.
Make sure to take care of yourself. You won't be able to focus and do your best work if you're stressed/your mind is somewhere else. Eat well, get 8-9 hours of sleep (sleep is vital!! Don't stay up till 2am studying) and exercise. Might help if before studying, go outside for a few minutes, go on a walk, etc, just to clear your mind of troubling thoughts. Basically, try not to stress and overthink too much. Easier said than done, for sure, but you can do it!! We all believe in you!
You are soooo so so so close to the finish line. Heck, I'm in year 11 and still have another whole year ahead of me, I so wish I was in your position right now. Just work hard for this last stretch and soon enough exams will be over and you will be free!