The shorthand educators use for this is "pre-K"—meaning instruction before kindergarten—and the big idea is to prepare 4-year-olds and even younger kids to be ready to succeed on their K-12 journey.

2016年6月四级真题（第一套）阅读 Section C

In these groups, which came out of an Eastern European tradition of developing young talent, professors teach promising K-12 students advanced mathematics for several hours after school or on weekends.

2017年6月六级真题（第三套）阅读 Section B