A: It seems that Olivia is always in her teachers’ good books.

B: That’s because she is an intelligent and hardworking student.

Note: This idiom means “in somebody’s favor or good opinion; having their approval.” It is perhaps derived from the terms “black book” (a list of disliked people). Then another idiom “in the bad books” has appeared, and later “in the good books” started to be used as its opposite meaning. If you are in somebody’s good books, it means you have done something good that has delighted them, and if you are in their bad books, you have annoyed them, and they are now angry with you.