This Short and Happy Guide is meant to provide students with the essential concepts and overarching themes that are most frequently tested on the MPRE. The Guide covers the rules of professional responsibility giving students the best introduction they can have as they begin their exam preparation.
I read this as a portion of studying for Professional Responsibility in law school. The book provides a very good overview for understanding the topic. However, I think that other more detailed study materials, such as practice multiple-choice questions, will be necessary for practicing for the MPRE exam, which is multiple choice.