Children's books are very helpful, and give you a kind of fluency with the low-level stuff that you will never get from SAT lists, etc. I think exposure to chil

Children's books are very helpful, and give you a kind of fluency with the low-level stuff that you will never get from SAT lists, etc. I think exposure to children's rhymes, poems, and nursery stories is useful if you really want to be fluent and probably necessary to get to a native-like level. (By the way: "vocabulary" is not countable!)