i can only really say how i have approached it - this may help or not! I have been using Kaplan Book for E1. I have read each chapter, made notes, re read notes tested myself on the multiple choice answers and tried section B answers. Done this for every chapter. 

 I am now re going over each chapter and practicing as many section a and section b questions.  

 Some time in May once i know the content i will practice section c answers as these questions don't just ask you to write about one topic, it could be marketing, it and operations management rolled in to one.  

Hope this helps