My grade school, or primary school as we call it here, didn't have any middle/high school elements mixed in. We basically lulled around, and had one teacher in one classroom for the entire year. They'd take us for library classes and P.E. or to the computer lab. There was no transitional phase either, so you were just thrown into high school life.

We Australians don't have middle school, only high school. I'm pretty sure all high school in Australia have periods and teachers for each specific subject. At my high school, we have six periods a day each with a different teacher depending on the subjects you take. No lockers though, as they kept getting broken into so the school took them out. Which sucks for my poor vertebral column.