I have the revision guide for chemistry, and to be honest, it's not bad, it's pretty good, and I find their stupid jokes hilarious. They cover a large majority, if not all of the content, but might be slightly lacking in some detail specific only to your board. But they do try to cover material for all boards, and helpfullly note this at the top of the page (e.g Don't look at this page/read this page if you do AQA/OCR etc.). Also as I do the abysmal Salters course which lacks information in some areas of chemistry (Sigma and Pi bonding, and shapes of sublevels for example) it was good to be able to use this book to read up on those. All in all, if you want to just be able to cram in a book and regurgitate it to get an A, then I would recommend a revision guide matched exactly to your specification. But if you can't find one, then you can't go far wrong with CGP, they are good!