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IB revision notes of subjects - anthroplogy, biology, chemistry, economics, english, geography, history, physics and psychology: http://www.revision-notes.co.uk/IB/index.html. Wikibooks IB pages for most of the IB subjects: ...
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Kstruct IB notes of subjects - anthroplogy, biology, chemistry, economics, english, mathematics, business, philosophy, history, physics and psychology:
Khan Academy - Excellent collection of videos to help you learn everything you missed in class about math, science, and history. Great for homework and exam preparation: