This is an excellent authoritative resource for those taking WJEC GCSE English Language.  It is written by actual examiners, and has sound advice on the controlled assessment, and the exam and goes through the specifications and Assessment Objectives, and how to aim and achieve an A.  From West London English and Media Tutor, English and Media tutor in Harrow, London 
http://paltip.com/westlondonenglish/!51i1