Does anyone know of a good comparison between different schooling systems in the world? I don't mean about their quality, but about stuff like ed asked. Is kindergarten or preschools are mandatory, How many years of schooling are required, are different schools are allowed to change the curriculum when they see fit (teach other subjects), and general "facts" like that.

Of course I can find all about it in Wikipedia, but that would take hours (for different countries around the world) and I wanted to save some time if possible. Thanks!

6 or 7, usually depending on whether you were born later or earlier in the year.

At 7 usually.