half term revisionWatch
We still have four days left. Make a list first thing tomorrow of all the topics you need to revise then work your way through them over our remaining days. You probably won't have time to do them all, so prioritise subjects based on how far away their exam is and do topics you are the most unsure about first.
Download an app like Forest and use it to time yourself for short bursts (e.g. 25 minutes) and break up your tasks with quick breaks (5 minutes ish).
Good luck to you - this is a massive slog but it'll all be done in 3 short weeks!