As I understand it (and my kids are all grown up now so it's been a few years) the way it goes in Canberra is like this:
Preschool - 1 year. This is only a little more advanced than daycare.
Kindergarten - 1 year.
1st grade, 2nd grade, 3rd grade, 4th grade, 5th grade, 6th grade - primary school.
Year 7, year 8, year 9, year 10 - high school.
Year 11, year 12 - secondary college.
When I was in high school, there were no electives in Year 7, and in Year 8 I got to choose what electives I would have for the other three years (I chose Latin, History and Technical Drawing). Year 11 and 12 were all electives, except for English, Maths, and Science, which were compulsory.
I'd like to see kids these days study more English grammar and spelling, because what they have now is atrocious. On the other hand, written language is evolving alongside spoken, and while awful from a grammar traditionalist perspective, it is rarely unreadable.