Preparing for the PSPOI

Hello everyone,

I am currently studying for my PSPOI exam and would like to solicit some sagely wisdom from 'yall.

Here is where I'm at:
-Passed PSMI with 90%.
-Know the Scrum Guide very well.
-Consistently score 100% on the Open exam.
-Have NOT attended any courses and do not plan too.
-Reading "Agile Product Management with Scrum: Creating Products that Customers Love" (Wonderful read btw)
-Applying my Scrum knowledge to my current role for the past month, emulating a PM.

Other than the standard "know the Scrum Guide by heart" and "watch YouTube videos", does anyone have any other constructive suggested study materials? It took me two attempts to pass the PSMI, so I would love to knock out the PSPOI in one fell swoop.

Thank you in advance for your suggestions!