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.
A physical copy is BEST for study. I’m entertaining the thought of acquiring at least a private license whilst simultaneously attending EMT school in a few months. This beats reading [the FREE *.pdf] on an electronic device! The quality is that of a book on the shelf at Barnes & Nobles. A+ Nice read for enthusiasts even.
I used this prior to going to Army Aviation School and it helped prepare me for flight. It has a lot of FAA rules regarding helicopters, general limits, etc that will better prepare you before any flight school. Highly recommended