Amazon calculates a product's star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers and factors that establish reviewer trustworthiness.
The books are okay for the amt paid...Only issue was of the 4 books one was a different one. I got a tracing patterns book instead of 11-20 numbers. Not raising a complaint as the effort required to explain the issue, return and get correct book is too high.
A nice set of practice books for nursery or lower kindergarten kids. The letters and numbers are well scripted and offer visual help to write. The colouring options (with numbers) keeps the kids interested to be engaged.