The exam you are doing is relatively new with only a handful of past papers and mark schemes available.
However I have made available here some 'legacy papers' and mark schemes from your exam's recent predecessor. You are strongly advised to use these in your revision
 
June 04 Exam Paper

June 04 Mark Scheme
 
January 06 Exam Paper  

January 06 Mark Scheme
 
January 08 Exam Paper
 
January 08 Mark Scheme