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Japanese privately run, after-hours tutoring school geared to help elementary and secondary students perform better in their regular daytime schoolwork and to offer cram courses in preparation for university entry examinations. Juku range from individual home-based tutorials to countrywide chains of schools and are staffed largely by retired teachers, moonlighting teachers, and university students. Though most juku emphasize academic subjects important in studies and examinations, some juku offer instruction also in nonacademic arts and sports.