The cut-off date was September 30, so any four-year-old who would turn five by that date was eligible.
Look for these clues: being giggly about a friend of the opposite sex; getting interested in the romantic plots of movies; or incorporating marriage into pretend play.
Today virtually all elementary education takes place in public schools.
Tuition to these schools is free, although families have to pay for school lunches, supplies, and non-school expenses such as extra books or lessons.
Competition to enter some of these "ladder schools" is quite intense.
Elementary school classes are large, typically between thirty and forty students each.