PPD was my last test with a PASS. I transitioned from 4.0 with CDS, PPP and SPD completed. On top of the mountain of info NCARB recommends I used Architect Exam Prep, Amber Books and Hyperfinearchitecture. Ben at Hyperfinearchitecture has a list of recommended books and those are pretty spot on, especially the Studio companion and graphic standards. It's also worth signing up and getting thru his "assignment."
I encountered the struggles with the questions others in the forum have so I'd just be repeating but this one was heavy on code references. However, my strategy is to read the question and take 7-17 seconds (Professor Steven O'Hara!) before I look at the answers and work at eliminating choices. At about 50 minutes left I was thru the test and went back to the marked questions, to my surprise only 6, and finished with 27 min. left. I did not use that time go back and review any questions! I believe the incorrect answers you've been reading on every question for the last 4 hours can play a part in second guessing all the questions you've made solid decisions on so no going back if there's time. Another thing that could trip you up, in the ARE handbook it states case study "questions do not build on each other based on previous responses." Just an FYI. Good luck and thank you to the individuals who have shared their experiences and info on this forum.