At the risk of stating the obvious, everyone is different. I love doing the Qbank. It is debatable whether it actually improves your exam prep, and I have never written level 3 exam, so I will not be able to add meaningfully to that conversation. Also what works at Levels 1 and 2 is not going to get you to pass level 3. “Level 3 is different.” Then there are those that say that there is an optimum way to approach this, and anything else would be a waste of time. Potentially everyone is right about what works for them. It is behavioral afterall.
Schweser Qbank helps me get started, and because of it my productivity and motivation is so much better. So indirectly I think that it will help me pass. In addition it teaches me a few concepts and helps me cross train.
It is not for everyone, and overall it might be a weak study tool, but it really does work for me, and perhaps you too da_mad_tiki.