para Inglaterra

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Note added at 53 mins (2005-12-07 13:58:30 GMT)
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Key Stage 4 - A LEVEL

It seems that it depends a little which country. I am from CHile and did all my schooling there. School system has Ensenanza Basica (1-8th grade called 1ero-8vo basico, usually starting at age 6) and Ensenanza Media (9-12th, which is called Primero a Cuarto Medio). You also have pre-k and K before that. After that you have Educacion Superior o Universitaria.
All the sites I read say Education K-12 in United Kingdom, including England, but this one site has years 12 and 13th (sixth form college (lower and upper sixth)?
"Education in England
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Education in England may differ from the system used elsewhere in the United Kingdom.

Broadly speaking, there are two systems: one covering England, Wales and Northern Ireland and another in Scotland. The two education systems have different emphases. Traditionally the English, Welsh and Northern Irish systems have emphasised depth of education whereas the Scottish system has emphasised breadth. Thus English, Welsh and Northern Irish students tend to sit a small number of more advanced examinations and Scottish students tend to sit a larger number of less advanced examinations. It should be noted that local English practice can vary from this general picture although across Scotland the system is well nigh universal.

School years
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Primary Education
Primary School or Infant School
Reception, age 4 to 5
Year 1, age 5 to 6
Year 2, age 6 to 7 (KS1 National Curriculum Tests - England only)
Primary School or Junior School
Year 3, age 7 to 8
Year 4, age 8 to 9
Year 5, age 9 to 10
Year 6, age 10 to 11 (Eleven plus exams in some areas of England, KS2 National Curriculum Tests)
[edit]
Secondary Education
Secondary School or High School
Year 7, age 11 to 12
Year 8, age 12 to 13
Year 9, age 13 to 14 (KS3 National Curriculum Tests, known as SATs (Statutory Attainment Tests))
Year 10, age 14 to 15
Year 11, age 15 to 16 (old O Level examinations, modern GCSE examinations)
****Secondary School, or Sixth form college
Year 12 or Lower Sixth, age 16 to 17 (AS-level examinations)
Year 13 or Upper Sixth, age 17 to 18 (A2-level examinations. Both AS-levels and A2-levels count towards A-levels.) ***
In general, the cut-off point for ages is the end of August, so all children must be at the specified age on the 1st of September of that year.

In some regions of England, pupils attend a Lower (Primary or First) School before going to a Middle School between 8 and 12 or, more commonly, 9 and 13 (for an example, see Isle of Wight School System), and then a High School or Upper School. Other, more vocational qualifications offered including GNVQs and BTECs.

Historically, Years 7 through 12/13 used to be known as 'first form' through Lower/Upper sixth form.

CHILE
El sistema educativo se organiza en un nivel preescolar, que atiende niños menores de 6 años, mediante una diversidad de instituciones y redes públicas y privadas; un nivel básico obligatorio, de ocho grados, cumplido en escuelas municipales o privadas; un nivel medio, de cuatro grados, que se ofrece el liceos con dos modalidades (la científico-humanista, de tipo general, y la técnico-profesional, que combina estudios generales y formación para el trabajo); y un nivel superior, impartido en Universidades e Institutos Profesionales o Centros de Formación Técnica (postsecundarios de 2 años de duración).