I used the York Notes for eng lit - they were also very helpful. I also had a CGP revision guide for RS, but it wasn't as good as the science ones I think. I didn't use revision guides for maths or the rest of the other subjects. You don't really need to get one for all of them Sciences were not my favourite, so I wasn't very motivated. All I did for revision was memorising the revision guides and practising some past papers right before the exams