I agree with the above post. I relied primarily on Schweser and referred to CFAI when I needed clarification or didn’t understand a topic. Using that approach, I didn’t feel like there was a single topic that flew over my head. Granted, I didn’t pass LI..so I know most will point to that as the reason, but it had nothing to do with Schweser v CFAI books. For level I, i was able to review all the material and take a couple practice exams the final week and a half before the exam. I took the same approach for level II (hey, it worked the first time), and it failed me badly. It takes much longer to review LII bc you’re required to have a deeper understanding of the material. I only finished reviewing half the material and wasn’t able to take a single practice test or practice any Qbank questions. I might as well have outright skipped the half I didn’t get to, bc it felt like that on exam day. It had been a couple months since i looked at a lot of the material.
Sincerely though, based on my results, had I reviewed the other half of the curriculum and sampled some practice problems, i think i would’ve done fine. Schweser as a whole works well, just don’t hesitate to reference other sources if you need to.