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I am a fan of drill and kill for those kids who need it (because many clearly do). Both of my kids, though, are painfully intolerant of repetition and are driven crazy by worksheets.

Here is a post from 2007. While it appears that the link to the source document is no longer active, the poster provided a brief synopsis.

Removal of repetition may be appropriate for differentiating the curriculum and experience for gifted learners.