This page will follow the Cambridge Syllabus (0654), here is a link to the syllabus, make sure you choose the right one for the year you will do your exam. Cambridge IGCSE Co-ordinated Sciences (Double Award) is a two year course that will give you 2 IGCSEs. (This website is based around the Cambridge IGCSE Syllabus but is UNOFFICIAL)
THERE ARE 11 BIOLOGY UNITS
USEFUL BIOLOGY WEBSITES
Try the GCSE Bitesize website. The AQA syllabus is the most similar to Cambridge IGCSE.
Try the S-cool website for GCSE Biology notes and revision questions.
Doc Brown has a great website. Here is a link to the Biology, sections.
ClickBiology is a site with lots of good links for IGCSE Biology (videos, podcasts, games ets).
Check out Ruru Hoong's IGCSE Biology Revision notes (careful, they are for separate sciences)