Not sure, I do AQA for Chem and Bio. I would just check spec for the other boards, or just get some papers and go through any questions that you know. If you've revised everything, you'll know when a question comes up whether you're supposed to know it or not. I've done all the further maths past papers for CIE OCR and AQA and I do edexcel. All were similar, but not sure if it's the same in all subjects.