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I studied exclusively from Schweser and it worked for me. I’m sure there is truth in that the curriculum is ‘the best’ – it is the source material after all, but I found that I blanked out quite often when I read the curriculum.
Prep materials may have their flaws, but they do summarize things better and have a better layout in explaining things. Schweser and Wiley are good ones if you’re looking for materials to study on your own.