That book basically just shows how to understand a case.
It's useful, but not if you've already been reading cases for a semester.
If you want something for exam tips get "how to do your best on law school exams". You may want to email Delaney directly, I think a new edition of the exam book is due out soon.
I can't speak to the old editions of any of his books because I have the most recent editions of all of them. I would probably go with the most recent editions if you can.