Hi, I’m in year 13 and predicted A*A*A so I can help you!! If you’re mocks are in twelve weeks, then that means they start on 14 May? I wouldn’t go full on with the revision yet, or you will probably burn out, and trust me when that happens it is so difficult to revise effectively. I would make a list of all the topics you have learnt (be as specific as possible because it will make revision easier) and decide how much time you want to spend on each (and then add an extra hour as a buffer). Use this to make a revision time table and make sure you stick to it, for example, maybe you could reward yourself every week that you’ve stuck to the time table? I would say beginning of April is when you need to start seriously revising, just please PLEASE be aware of burn out because it is horrendous when it hits and it doesn’t give you any warning!!