OCR A level Computer Science overview
http://www.ocr.org.uk/qualifications/as-a-level-gce-computer-science-h046-h446-from-2015/
PDF of A level specification
http://www.ocr.org.uk/Images/170844-specification-accredited-a-level-gce-computer-science-h446.pdf
PDF of AS level specification
http://www.ocr.org.uk/Images/170845-specification-accredited-as-level-gce-computer-science-h046.pdf
Buy the course book: http://www.hoddereducation.co.uk/alevelcomputing/ocr
Visual Studio 2010 Express Download link
(What we use in school – it’s FREE)