I have a three day revision rotation:
Day 1: Biology, Chemistry and Physics.
Day 2: Maths, History, Geography and R.E.
Day 3: English Language, Music and Resistant Materials.
Day 4: Repeat.
I'm spending > or equal to an hour per subject per night on weekdays, starting at about 6:30 - 7:00, and three to five hours at weekends. I'm making revision summaries, reading through my textbooks/ exercise books and answering/ working through problems on the subjects I have revised. I'll increase it to five hours per night after Easter.
I did two of my G.C.S.E.s last year, which helps!