Gittins just mellows down the government's current economic policy so that students like us can understand them. In your textbook you learn the concepts you need to pass the exam, if you can apply some of Gittins statistics that would be good. Also if you can't understand something your teacher or textbook has informed you about then Gittins may address it in one of his articles. It's important to research from a variety of mediums, his articles are simplified, yet extremely effective! Go Ross ^_^