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 analyses reviews to verify trustworthiness.
Bought this for my son for school and it helped him drastically. He loves having cliff notes to help him recall parts of the story or get a better idea about the plot, character or summary. Gives him help on his tests as well.