The above link is a list of revision guides recommended by teachers. Some subjects give a choice between different publishers because they all produce useful guides, and it is your personal choice which layout suits your way of learning. Whichever guide you buy, ensure that it is the one relevant to your course and the correct exam board. You do not need all the guides listed, so it is a good idea to get advice from your teachers.
Some departments will supply revision guides to students, so ask your teacher before buying.
ONLY CGP revision guides and Maths can be ordered from Mrs Hopkin in the library at a reduced school price.
If you are not sure whether you need a revision guide, talk to your subject teachers for advice.