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Im old school so prefer the books to scribble all over, however with the ebooks you can highlight some text and leave a note which is quite handy.. from a personal point of view for level 1, I think schweser is a must, qbank is great for practice after readings, their mocks are good and the books themselves are shorter than CFAI but still cover all the need to know stuff.. however I did not find this was the same for level 2 where I think CFAI books/ebooks are the best option