The purpose of the brush-up course is to draw together what you have already learnt. No new material should be presented apart perhaps if a new question has come up in a recent exam outside the syllabus (it does happen occasionally). The reminders you get there, plus any revision work you do after (I would recommend most people have at least a week's gap between a brush-up course and exams. When we set up distance learning this will be structured into the course) should fix in your mind what has faded, and focus you towards the most important material. This is important and is difficult when you are learning on your own, with no-one to guide yu to concentrate on fundamental or commonly-examined material.