Hi, thanks for your input. I appreciate your questions and I hope the below will be satisfactory and convincing!
Since maths is my favourite A-Level subject, I happen to also be taking further maths. I find the best way to "revise" for maths is by practising. I have put revise in quotation marks because I don't think revise is the correct word to use when referring to maths exam preparation because all that's required is the completion of all past papers and the completion of all book questions (if possible). The moment you finish all book questions as well as past papers, you should feel prepared. The only time I would use revise is when referring to statistics or mechanics (mainly statistics though!) as these are the applied modules that require you to learn specific formulae, etc.
To be more clear, maths preparation is quite simple. Sit down, read and copy down the examples (with understanding, not just copy/paste. In fact, I would recommend that you look at the example and attempt the question before actually reading the worked solutions) and then do the exercises. I'm not sure about which modules you're sitting for which exam board, but I can tell you that you should finish all the questions/past papers at least a week before your exams. This will leave you some time to ask any teachers for any problems you're facing so that everything's sorted before the exam.
Another tip: Maths is more to do with understanding than memorising. I feel that sometimes you have to memorise steps to understand why you have to take them to reach a solution. This is how my brains work at times - I have to memorise how to get a solution to a particular type of question in order to understand why certain steps need to be taken. Then, after memorising and understanding, attempt the questions, then do past papers. This will consolidate your understanding and will make you able to recall how to answer that type of question during the exam. If you can't understand something, always ask. The answers to your questions will also be recalled during the exam, trust me!
Good luck! If you have any more questions, just ask!