Quant difficulty doubt

Hi. I was going through your easy to hard video series in quant, and I noticed that I was struggling with the hard questions in Probability 1, 2 and combinatorics, specifically the last two questions of each of these topics. I wanted to know if questions of this level actually show up in the real gre and i should start focusing on those, or should I just stick to my fundamentals? because the rest of the questions were a breeze.

Are you going for a perfect score? If not I wouldn’t worry so much about it