The AS exam papers consist of a short case study followed by 6 or 7 questions, several of which have two or more parts. The timing for both papers is 90 minutes and there are 60 marks. (Approximately 1½ minutes a mark, but use less time on short answer questions and you need time to read the case study.) To get an A grade, you need to score 80% or 48/60.
http://www.tutor2u.net/blog/index.php/economics/comments/top-ten-tips-for-ocr-as-economics/#extended
