This is a short book - you can easily read it in an afternoon - but a real pleasure. It's presented as a quizbook but that's actually misleading: though the first part is composed of questions of varying difficulty, the second part, answering those questions, explains the significance of tiny details in Austen's novels, and is the reason why you'd actually want to buy it.
The readings do occasionally suffer from being a little glib and simplistic, but the book is both entertaining and useful. It's written in a very accessible style and would be a stimulating read for fans of Austen novels, as well as really helpful for students learning to decipher the sometimes complex subtext of Austen's writing.
Do note that the Juvenilia and minor novels are excluded, which undermine the sensitivity of some of the readings, but on most points you're in safe hands with Deirdre Le Faye, the ultimate authority on all things Austen.