I got information from a friend who's taken it already that it was a kind of booklet with laminated pages, the size of A5. The reason why you have to ask for new one after filling up is because you get a permanent marker to write notes (especially useful for QR), and not a normal whiteboard marker you can rub out. A tip is once you have a small space left, ask for a new one while thinking about next q, as it'll waste more time if you ask for new one after you run out of space.