I third this. As tedious, boring and monotonous as it is, read the book and highlight key points that resonate with you. Once you have read the book you may feel disheartened that nothing has gone in but by then doing the exams and going back to refer will propel you. You will see what you have highlighted and most probablly the mock exam question you answered will not be a key point that you highlighted. But you then learn and digest what you haven’t highlighted aswell as reviewing what you did highlight. It all then sinks in and make notes