I am retaking unit 4 (Biology and Chemistry) does anyone have any revision notes with all the topics on with example, summaries etc?

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The exams in January didn't go according to plan, so I am going to retake both biology and chemistry unit 4, and I was wondering if anyone had revision notes on all the topics within those units for edexcel, however not a 50 pages long!!! 

Thanks Daisy 

Posted Mon 12th March, 2012 @ 16:02 by Daisy