I've taken the CCDP exam three times now and have failed each time.
First attempt: Free Cisco Live attempt on a whim. I did zero preparation and scored a 702
Second Attempt: Studied the CCDP FDLG, scored a 689

Third Attempt: Studied CCDP FLG even more, scored 702 again.
for some background, I have the CCNP RS and CCNA: Data Center and approximately 6 years experience in the industry. In my experience, this exam is about 70% common sense, which I believe is about all I've been able to answer correctly. The remaining questions left me confused as they didn't seem to have a clear answer. Seemed like the questions were up to interpretation.
Study materials have mainly consisted of the CCDP FLG. I started to read the CCDP ARCH Simplified book but the book was riddled with mistakes. There were lots of grammatical errors and contradicting info, so I ditched it. I've since picked up Top Down Network Design by Cisco Press. So far the info hasn't been specifically relevant to the exam. I'm 33% through the book though and it's just now getting into actual network design discussion.
I haven't sat the DA exam. I'm just trying to pass the DP exam so it will renew my NP. I figure i can circle back and get the DA to get the full cert when I'm done.
So, with all that said, what else can I do to hopefully ensure the 4th attempt will be my last?