Hey @BioEngineer, deep breath!
I do find the exam more similar to the NCEES practice exam than the PPI exams (which is probably not what you want to hear). That being said, with my successful attempt, I too had a freakout moment when I took the NCEES practice exam 2 weeks out from the exam and bombed it. You're still 2 weeks away, so while it might be too late to dive really deep into any new topics, I'd use this as an opportunity to review a couple of things that are still giving you issues. And like someone told me when I made a similar post back when I bombed the NCEES practice exam, it's a good way to remind yourself not to get too cocky on exam day and really read through every question. I think only you know best whether you need to push the exam back or not, but know that bombing the NCEES practice exam isn't necessarily an indicator of how you'll do on the real thing. You got this