People say that but usually the truth is the second or third book is the "best" (regardless of which book) but really it's because the material sinks in after m

People say that but usually the truth is the second or third book is the "best" (regardless of which book) but really it's because the material sinks in after multiple itersations, other worse because the material feels familiar even though the student hasn't actually learned to solve problems, they've just memorized bits.