I thought the actual exam used multiple angles to test you on a topic, whereas the Qbank questions were more straightforward.
Removing the easy questions would probably give you a better idea…I never did this, so I can’t say from experience.
Here’s what I would do:
1) CFAI EOC questions are very similar to the real thing (especially those towards the end of each section). I would do all of them.
2) Use Qbank to nail down topics you’re having trouble with. I made 95% of my Qbank quizzes on single sections (FRA, EQ, FI, Ethics especially)
3) Schweser mock exams are pretty accurate. Do as many as possible and really review the answers.
4) CFAI mock exam is a must. VERY similar to the real exam difficulty. I got crushed when I took it, but it made me really focus and lit the fire I needed to pass.