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First go through and make sure you understand the content. A-Level Chemistry is very big on concepts! Then, and I really can't stress this enough, do as many questions as possible. Chemistry is an applied science, memorising alone won't really get you far. By answering questions you'll understand what details you've missed out and the overall language + keywords they want you to use in your exam.
Asked by Camila
What is the molecular formula of a compound, that its empirical formula is CH2 and n = 10.