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A Junior school is a type of school which provides primary education to children, often in the age range from 8 and 12, following attendance at Infant school which covers the age range 5-7. (As both Infant and Junior schools are giving Primary Education pupils are commonly placed in a unified building housing the age ranges of both Infants and Juniors - a Primary school).
In South Australia a junior primary school, it is where a child will begin their education, usually in or before the year level preceding Year 1. Depending on the school, a child will move to the main primary school between the ages of 8 and 10.
In most primary schools, the junior primary is located within the same buildings and grounds as the primary school, although some junior schools are located on an adjacent or separate.
A junior school forms part of the local pattern of provision for primary education. Most junior schools cater for pupils moving from infant schools from the September following their seventh birthday. Pupils join in Year 3, and stay at the school for four years, leaving at the end of Year 6 when most pupils are aged 11. These four years form Key Stage 2 in the English education system. At the end of this time, most pupils will move to a secondary school.
In the late 1960s and early 1970s, a significant number of junior schools were abolished in favour of 8-12 or 9-13 middle schools, and while some of these remain open today the majority of them have been abolished in favour of a return to traditional 7-11 junior schools.
In some London boroughs, a JMI is a "junior mixed infant school" which caters to children aged 4 to 11. Some have been renamed to the more common "primary school".