Best Way to Prepare for the MPRE
The best way to prepare for the MPRE, besides the obvious review of the ABA's Model Rules, is to do a LOT of MPRE-style practice questions. This book has more practice questions than any other book on the market (even more than the BarBri/Themis/Kaplan books), and it covers more of the rules and exceptions:
https://www.amazon.com/dp/ 1790544084/
I have also authored the Glannon Guide for Professional Responsibility that has around 230 questions, with explanations following each one and chapter introductions (overviews of a group of rule provisions). The explanations are helpful, I think, but a simple hint about the operative rule provision is usually all you need to understand why an answer was correct and the other options were wrong.
https://www.amazon.com/dp/
I have also authored the Glannon Guide for Professional Responsibility that has around 230 questions, with explanations following each one and chapter introductions (overviews of a group of rule provisions). The explanations are helpful, I think, but a simple hint about the operative rule provision is usually all you need to understand why an answer was correct and the other options were wrong.