I need 5 A's, help?

A set routine of revision/study was never helpful for me. What I did find helpful was making sure that I had resources within easy reach all the time. If you have revision guides and past papers nearby, then it's likely that you'll end up studying instead of procrastinating because your study materials are just too far away. So my advice would be to not set time limits for your studying, instead say to yourself that you'll try an exam paper/half an exam paper and that will be your revision in a certain subject for the night, or you might choose to do a page of problems/write out notes from memory instead. Take a break when you feel as though you're flagging (have a drink of water, stretch your legs, eat something) because study is always most effective when you're alert, and basically try and turn your study into a hobby rather than a strict revision timetable.

I know that past papers, and learning formulas, are the best techniques for success in maths and science subjects. In terms of English, I'm not exactly sure what your English exams consist of, but if you have any set texts try and get a York Notes for them. They'll teach you the lit side of things, such as what kind of themes you should be looking for in each text, and reading them will give you a few facts to draw on when you get a question. If writing is what you struggle with I'm not sure what to recommend, other than do some reading to get a feel for spelling and grammar. Reading is the best way to improve English in my experience.

In terms of books, I taught myself with CGP, Letts, Collins, etc for the sciences. I think most of those cover the Higher syllabus as well as A level.