this is for people doing OCR gateway science B, for module B5. it is based on the syllabus so it is everything you will need to know. If you think there are any improvements I need to make, please contact me. And please feel free to comment and rate this resource. There is also a revision powerpoint for B4 and there will be one for B6. There is supposed to be a diagram of the kidneys for one of the questions, but I couldnt find one that I liked, so sorry.