I have found quite a few mistakes in various technical prep books in answers, explanations and calculations, 'Ace the technical ...' by Bristow and the one by Air Inc. .
The one book that ALL these books can't even come close to when it comes to accuracy is 'Aerodynamics for naval aviators', it's a bit dry to read but it's top info which the other books try to emulate. It doesn't cover weather and such though, just aerodynamics, propultion, performance, etc...