The following links will take you to some very useful revision websites:
S-cool
http://www.s-cool.co.uk
BBC bitesize
http://www.bbc.co.uk/bitesize
Letts and Lonsdale
http://www.lettsrevision.com/students
CPG
http://www.cgpbooks.co.uk/pages/homeStudents.asp
Another random GCSE revision site
www.gcse.com
If you know of any good revision sites that should be added to this list, please let us know and we will add them on for you.