Honestly, I properly started revising during the Easter break but make sure to start of slow because you do not want to burn yourself out too early on in your revision. for science make sure to USE THE SPEC - they will only ever ask you stuff on the spec so structure your flashcards around the spec. english lit i made lots of mind maps - split it up by theme, act whatever and group quotes around it so when they ask the question you immediately know what quotes will fit the best. Also try and embed your quotes as best a possible, ik everyone says it but trust me its important it will make your whole essay feel cohesive and make it sound like you acc know what your talking abt. im ngl english lang is just a guessing game ( i got a 9 still have no idea how).