Definitely not "precious." "Exquisite" is better than "precious" but English speakers wouldn't really say that about a book. Maybe just something like "valuable"--or a phrase like "exceedingly well written."

It’s not clear what you mean. You can say of a book “The writing is exquisite.” “The book is exquisitely written” “The book is exquisite.” (Possible) But that doesn’t have anything to do with “pedagogical”. You can always look up the meaning of large, rarely used words in a dictionary.

well-crafted - covers the well written. coherent, informative. . Try a thesaurus on each of your words?