Definition
It can be said Reading, if someone had read at least one topic over the past week,and he knows / understands the contents of the topic or at a minimum had read one page of a book. Parents who read a storybook to the children is categorized reading a storybook, while the children who just listen are not categorized as reading.
School textbooks are books issued by publishers used for teaching school lessons, for instance textbooks of Mathematics, Indonesian Language, English etc. Someone is considered as reading if the book content has been read at least one page.