Science decodables engage all learners, who may be more interested in learning facts. Every story has been written with a strictly controlled text, so that children are only exposed to those letter sounds that they have previously learnt.
To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyzes reviews to verify trustworthiness.