How do I know how many times a child has read a book?

There are a few ways to see the number of times a child has read a book. On the pupil reading page, in the current book column, there will be a read count. This will be a little circle with a number in it. 

Or if you want to see more detailed information about the number of times a child has read a book then click on their name on the pupil reading page. Then click on the bookshelf tab. You'll then be able to see a list of all of the books the child has read. To the right of the book title you'll see an arrow. If you click on this more information will appear about the reading history of the book.