In Denmark, school is mandatory for 10 years. Most people start the year they turn 6 and graduate the year they turn 16.
The first year is sometimes called 'børnehaveklasse' which translates to 'daycare class' given that it is a sort of transition from daycare to school, even though it doesn't have anything to do with daycare.
Formally it is called '0. klasse' (literally translates to 'zeroth grade'). Then the grades are called '1. klasse, 2. klasse' all the way up to '9. klasse'.
I've never heard of a 'zeroth grade' in any other country and I honestly find the expression confusing. I think it would be easier to just say first grade as it is the first year of school.
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Yes, there’s a “grade 0” aka “zerówka” which is basically a year of prep before starting actual school and it’s mandatory for children who are 6yo or will turn 6 by end of the year.
We don’t have a grade 0 in France and our school actually starts earlier than in most countries. Elementary school starts the year you turn 6, but before that we have “école maternelle” that lasts 3 years. Until recently, it wasn’t mandatory although almost everyone went, but this changed a few years ago, which means school is now mandatory from the year you turn 3.
Then it lasts until what is usually called grade 12 in other countries, the year that starts when you turn 17.