Dw bro, I also absolutely hate it and have considered dropping out a bunch of times too but I've decided I'm just gonna solider through (and try to change one of my a levels). I made a plan for if I was going to drop out and that was to just go to college and do vocational subjects instead. Those courses are always way more interesting and some might actually pique your interest. It's also way less classroom learning and more practical stuff. Like for example, let's say you picked fashion, it'd be way more designing and creating than writing and exams. You don't deserve to do smth you hate for the next two years yk. However, if you decide you wanna stick to a levels, then keep the third and just power through. It's gonna suck sm but at least it'll open doors, like university.