This is because, in Argentina, there's kindergarten, high school primary school, and secondary school. In some provinces of the country primary is from "1st grade" to "7th grade" and secondary school from "1st year" to "5th year". In other provinces, primary school is from "1st grade" to "6th grade", and secondary school from "1st year" to "6th year" or "7th grade", if the school has it. All technical schools have "7th grade". So basically there are between 12 and 13 (most schools), years of school in the Argentinian Educative System, without counting kindergarten, which can be from 3-6 or 2–5 years old.