Passed Mechanical MDM, 1st try
Morning section definitely felt that I got 35 solidly and remaining 5 were likely right but was just less confident. Did not have any question where my calculations didn't yield an answer in the choices (yes, I know many answer choices are deliberately created with one minor error in calculations). Walked out with time to spare.
Afternoon section was definitely more difficult. I think i was confident on 20-25. Remaining questions again, my calculations always yielded an answer from the choices. Only had one problem where I was forced to plug answers in and guess and check. One thing that really hit me hard was a post lunch slump, really had to struggle for a bit to keep my eyes open.
So probably 60/80
I took the PPI class for this exam and my feelings on it are mixed. My employer paid for it so ROI is technically infinity. However PPI's machine design class covered topics that weren't even in the exam specification. I think most of the class was a great way to recall my knowledge from my college classes a decade ago, and a class structure helped me study and pace myself. Definitely glad I came across this board and looked into additional resource material. Also doing a practice exam in a simulated timed condition really helped me get confident that I could pace myself and get to all my reference material in time.
One thing that helped me was on a last minute call I brought my materials book and it helped out on some questions that I'd be guessing otherwise.
Bound copy of the NCEES PE manual (with a lot of corrections written in)
NCEES practice exam
PPI 6 minute problems
PPI practice exam
Binder with personal notes
Shingley's Machine Design
Mark's Standard Handbook for Engineers
Hope this helps out any future test takes, good luck all!