listen, if i could go back to gcse's the first thing i'd tell myself is to stop worrying about if i started revision too late. I honestly did very light revision and just made notes, basically wasted my time, tricking myself into thinking I was revising to clear my conscience. Then about three weeks before the exams, I started proper revision. Like memorising the stuff, stragiht from the textbook. I soon found out that with GCSE'S as long as you understand the stuff, even something like history, you can revise like a week before, but putting in a lot of hours. Except for Geography, that **** was hard. I got three a stars, three a's and three b's. As long as you start now, I promise you it's the right time to start. Not too early, not too late. Just do more hours, about three or four a day. Andyou'll get the grades you want. I think you're just worrying, happens to everyone. Good luck mate.