I have assigned each child a book at their level on Raz-Kids. Your child should listen, read AND do the quiz for each book. They need to be working on level up, not in the reading room.
Also, if your child is having trouble on the quiz with a specific skill for example, the author’s purpose: they can use IXL to strengthen their skill then complete the quiz. If your child does not complete all tasks, they can’t go to the next level.