Text Book End of Chapter Answers After you have worked through each chapter there are questions which are based on exam past paper questions. You should work through these and then mark them using the answers which can be obtained through this link. https://global.oup.com/education/content/secondary/series/ocr-a-levelsciences/alevel-sciences-for-OCR-student-book-answers/?region=uk This will help embed your knowledge and give you the opportunity to practise applying it. Further past paper questions and mark schemes are available through the OCR website http://www.ocr.org.uk/i-want-to/download-past-papers/