I took the PPI course from Kaplan. It was good for a "refresher" but what really helped me was taking a bunch of old practice exams. I jumped into a conference room at work on a few Saturdays and timed them like I was actually taking the exam.
Also, my state's professional license lookup has been down since the beginning of last week, so I can't even rely on Futile Exercise B. I'm being taunted by both NCEES and ND PELS 😭