It's my summer holidays and I'm transferring from Year 10 to 11, and all of my friends have started revising. Theyve got detailed study plans and mock plans. I'm doing 10 Higher GCSES and predicted a 7 in maths but everything else 8 and 9. I find it really hard to revise and end up making all the fancy timetables and flashcards but never use them. When should I start revising for mocks/ GCSE?