No – fortunately, you don’t have to. At the beginning of the school year, you get all your books at once. The rest of the school year, the evening before you go to school, you check which subjects you have the next day. You then pack your bag with the books you need that day.
Everyone at Maartens has their own locker. Here you can put your jacket and gym equipment, for example, so that you don’t have to take them with you all day.