Some extra IGCSE tips please?

I'm doing my Cambridge IGCSEs this May/June 2014 session. I take 8 subjects, English as a Second Language, Math, Biology, Physics, Chemistry, ICT, Economics and Business studies.

The first six are predicted A*s, however Economics and Business are sort of my weak areas with probably an A or B for either.

How do I develop my answers more effectively for and score an A* in the commerce subjects? Is plainly memorizing good or should I do a lot of past-papers? Any extra revision techniques will help. Thanks :)

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