Exactly what your students need to do well in their AS Business Studies exams â a brand new Revision Guide that provides excellent coverage of the new AQA, OCR, Edexcel and WJEC specs. ItâÂÂs written in really straightforward language and even has a few jokes to help with that well known RISD (Revision Induced Stress Disorder). WhatâÂÂs more, itâÂÂs packed with revision questions, exam practice and loads of advice on how to do well in the exam.