Go to the past paper directory (see related link).
There you'll find the most comprehensive directory of past papers on the internet. Pick your subject then exam board and click on the button. It'll take you directly to the exam boards subject page which is full of past papers.
You can also try looking out for chemistry notes
You can visit igcsechem.webs.com (advanced) or ks3science.webs.com (basic) to learn more chemistry!
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