IGCSE Revision advice?

Try 4 to 6 hours a day, as otherwise your brain will "overheat" and studying won't be very effective. Also, remember to keep a sleeping pattern - sleep for about 8 hours every night and try to wake up before 10 o'clock. The morning is the best time for the brain to absorb information. Find a good technique that will help you revise, I'll give you a link that will test you to see what type of learner you are.

http://www.educationplanner.org/students/self-assessments/learning-styles-quiz.shtml

Hope that helps you a bit!

I think 8 hours may be a bit too much, you do need some time to rest.
If you're bored, do past papers. I can still remember stuff from my mocks, too, so that's what I'm doing.