Hey, I too am in y12 so I'm still working this out as well. I've not really started any major revision yet - that will mainly consist of writing up notes when I come to it. I've found sport really good for relaxing, I run and cycle and am not particularly brilliant at either, but they give you a great chance to clear your head for an hour. Why do you need all A's by the end of the year? in our school the requirements for y13 are Ds or something. Obviously I'm gonna be aiming for As😂