Hi Manu,
If it were me, there are a few areas I would analyse to see how best I could help myself. It's sometimes painful to go through this, to dig down and isolate the root causes, but it's necessary if we want to find the solution.
First of all, when you are reviewing the quiz and practice exam questions that you haven't answered correctly, are these generally due to you not knowing the subject material well enough, or is there also a component of answering technique involved? By which I mean, you're not identifying the correct answers due to not having read or understood the question/answer options fully in the time provided, or something similar. If you do a large batch of quiz questions now, but take as much time as you need (selecting the untimed variant), do you obtain significantly better scores?
Outside of PM Prepcast, what have you used as study material in your preparation? How well do you feel you have internalized the content that you have studied. How do you actively absorb the material? Do you write and edit study notes? Do you use tools like flash cards for memorization of glossary definitions and the like?
Are there other important texts that you haven't yet studied? I recall there being a thread somewhere here that identifies the most recommended content, which is not necessarily all PMI publications. Is it worth accessing any that you don't have?
Is there perhaps someone you have studied under or alongside, who has got to know you and who you feel you can talk with frankly? Could you sit down with them and ask them to give you an objective outside perspective on where you could improve?
Finally, you mention that your exam is due to take place in 10 days' time and that don't want to postpone. I can well understand that, but perhaps don't reject that option entirely. Unless I'm mistaken, rescheduling costs USD 70. That isn't nothing, but it's by far the cheapest option. If one fails the PMP, retaking costs significantly more -- not to mention that one of the three possible exam sittings in the eligibility period will have been used up.
It's up to you to weigh the importance of the financial cost of these options against the possible time lost and emotional cost to you of either postponing or possibly not passing on your first attempt. You could also pass in 10 days's time, of course, I'm just looking at worst possible scenarios.
Hoping this all helps in some way. All the best.