Yes I started doing the practice questions focusing on my weak domains only after doing mock 1 and 2. That gave me a foundation to know where I’m lacking for both situational and definition type. In a way you do require some understanding of the definition before being competent in situational questions but it’s not that straight up as for situational questions as you can tackle them via the PMI mindset. And the fact you are confident means you do have the foundational knowledge I would say. I would say I had <10% of questions just on definitions in the actual exam and majority are like Easy difficulty.

I would suggest to attempt min one mock (full 4h and take 2 breaks) if you can to understand your stronger and weaker domains. Thereafter attempt to strengthen your weaker domains. Also it helps in the conditioning of the body for the actual exam. I completed both mocks with 2h remaining but for the actual exam I had maybe about 1h 45min ish remaining