Don't worry about them, seriously when I took them, other than maths I did about 1 hours revision for each subject, now I'm not saying don't revise, I'm just saying don't worry. The papers are so linear and straight forward that as long as you listened in lessons and know how to relate topics to a question you should breeze them.
Although when you get to AS/A levels you'll probably want to do more work. I actually try and revise a solid 2/3 hours a day now, and to be honest you need to.
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