I know that loads of people have said not to revise too much, but honestly in year 10 I did no work and if I had done some, especially in art, I could have come out with more A*s. Obviously it depends what your aspirations and predicted grades are but, if you don't revise right now, you should at least make sure that you start consolidating things quite early as it will mean lesss work later down the line. Above all, it pays to be organised. Pay attention to coursework deadlines so that you don't run out of time, and look at the weightings of each module in your GCSEs so that you can prioritise things. If you don't understand something, ask as soon as possible after the lesson to get clarification so that you don't have to do it at the last minute in May which can be quite stressful. Obviously don't forget to take breaks and at least one or two days off a week where you have fun, but the summer afterwards can be a lot of fun and that is the time where you should make the most of slacking off.