Thanks for your response. This is not a mistake, it is simply the design of the course. All of the information for this particular strategy is provided in the slides themselves, you do not need the Academic Curriculum book to learn this. In future, we will likely update the General IELTS course to only reflect materials found in the General book. I am certain that your score will improve as long as you keep at it. Let me know as questions come up, I am here to assist.