The twelve years of public school education usually begin when a child is six years old. Some school systems are divided into eight years of primary school and four years of secondary school. Primary schools are often called elementary schools, and secondary schools are called high schools. Many systems combine the last two years of elementary school and the first year of high school in what is known as junior high school. This is followed by three years of senior high school. A large number of school systems also have a kindergarten program that provides one year of preschool training for five-year-old children before they begin the formal school years. The academic year lasts nine months, from September to June, with winter and spring vacations. Classes are held five days a week, from Monday through Friday.
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