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Ive tried bitesize but do you know any others ?
Oops, spoke too soon.
Ive been trawling the internet hopefully these will help:
http://gcserevision101.wordpress.com/biology-b3/ (This site has alot of materials, not only Bio.)
Username: gcse2007 Password: stephen
For Edexcel, you are much better off using the ActiveBook.
I don't know of any dedicated sites for the separate sciences for AQA