Revision
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PMG Biology
A blog from a Biology teacher all about Edexcel IGCSE. Really useful reading for revision, and updates just before exams give helpful hints.
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Revision game
Zombie attack game for learning iGCSE definitions.
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S-cool
Revision notes and past questions (you need to register but it’s free)
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Schoolsnet revision
This site used to have some good revision lessons – but you now have to register to use it (still free I think)
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Stamp Science IGCSE Biology revision
Very useful revision for IGCSE Biology (this is Cambridge syllabus, co-ordinated science = dual award). There are lessons, notes, revision sheets and videos here organised into topic areas.
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Study Rocket GCSE triple biology AQA
Biology revision notes, glossary, diagrams, quick questions. Free to access. These are for AQA not IGCSE but many topics are the same.