Just received a pass after taking PPD yesterday afternoon; less than 24 hours to get scores back! Now just hoping to get a pass on that PDD exam; which I am definitely less confident about :/
I took PDD 4 days before PPD, and didn't do any studying between. I would have scheduled them the same day if possible; and after taking both, highly recommend taking them back to back. PDD had some specifcations; PPD had some site design & programming; but otherwise you need the same understanding of construction techniques, details, costing, structures, hvac, electrical, acoustics, & lighting.
I wrote a really longwinded thing after I tested PDD with more specifics about study materials and strategy-
viewtopic.php?f=29&t=47682&p=163367#p163367
Good luck to everyone out there!