Past Papers

I find that past papers are one of the most useful resources when it comes to revision. There are different ways you can use them, either sit the paper under timed exam conditions, do it as an open book exam and look at your revision guide to help, or use it alongside the mark scheme to find out the best ways in which to answer certain questions, particularly big markers!! 

Here's the link to the OCR website so you can look at all the past papers they have available: 

http://www.ocr.org.uk/qualifications/as-a-level-gce-chemistry-a-h034-h434/