chemistry

How do i revise my chemistry paper 1 to get higher marks in order to move my sets

Simply do enough past papers until you learn the answer that they are looking for. A lot of gcse chemistry is just the same questions that always can be answered exactly the same so if you do enough of them, you'll remember the answer and always get the marks.
As well as this, the other main part of gcse chemistry (and chemistry in general) is calculations, so make sure you know how to do each calculation well and you are able to do them with weird numbers (decimals, rearranging formulae and converting mass or time)
Best of luck!