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The end-of-chapter questions from the actual CFAI books are very useful. Beyond practicing with those and CFAI’s mock exam(s) I would definitely just recommend using Kaplan Schweser’s study notes. You may miss a tiny obscure detail here and there but you’ll really be able to spend your time focusing on the most important stuff. For level 1 you can find a decent amount of free stuff available from a variety of prep providers who will want you to pay for their materials for the next levels. I’d recommend surfing around and seeing what is available for free for level 1 as well.