It could be explained by the remaining questions in the pool, but all these mocks can easily be attempted twice. And seeing your previous scores, I don’t think that should be the case. Otherwise you would have received more harder questions from the pool rather than easy ones because you should have exhausted all easier ones in your previous attempts. Also gmat club difficult level can vary as compared to the mocks, so it’s always good to not rely heavily on one (as gmat club forum vs test question difficulty is also quite diff sometimes). To add to that, this test is not linear. You might find an easy question after getting a hard one right even in your real test, so don’t overthink on your performance. Best way to interpret these results is to understand if you got what you knew right (lock those strategies), how close you were on the incorrect ones and what change you could bring to your practice sessions to address those shortcomings.