Before taking GA MPJE, I had consistently heard that it was awful and not a well written exam, and now that I've taken it, I can unfortunately say that is all true. However, my strategy going in to take the exam was to use numerous different resources for preparation, and I ended up passing with an 81. The resources I used were:
1) Pharmacy Law course notes - I went through these twice. The first time I just read over everything, the second time I made note cards over any and everything that I felt was detailed enough or specific enough that I knew I wouldn't remember it.
2) I read the "Guide to Federal Pharmacy Law" 9th edition. As I was studying the above class notes I would then read the corresponding text in this book. After I was done with my notes, I went back to this book and read all the other sections as well. I practiced the questions at the end of each chapter and also the 300 questions at the end of the book twice. I reread sections related to the questions I missed.
3) I practiced the "RX Exam" GA law software questions twice.
4) I read the Feinberg GA Law chapter and the Federal Law chapter once each.
5) I studied through a 200 slide PowerPoint my Law professor had made as a review for us. I went through it twice.
6) Studied my note cards I made at least 2 - 3 times, depending on whether I was remembering the info on the card or not.
7) Anything that I found unclear in the above resources I went to the GA BOP website and read the actual Law's wording. This only happened for a handful of things though.
I studied 2 - 3 days a week, 4 - 6 hours a day, for about 4 or 5 weeks. This is definitely longer than most prepare for MPJE, I'd imagine, but the delay in receiving my ATT and then lack of test center scheduling options equaled I spent this much time. My advice is to use multiple resources to prepare, but that's really my learning style - reading the same (or similar) stuff from various resources helps it stick in my mind. Hope this helps!