It depends. You shouldn’t be charged for the cost of teaching or materials used to deliver the school curriculum (like printing costs).
Schools can charge for materials if the end-product belongs to the student. For example, materials for subjects with practical skills (like clothing and workshop technology). You should be made aware that there are costs for materials at the start of the year.
If you’re uncertain or disagree about whether an activity is part of the school curriculum, you can contact the Ministry of Education about it.