Does "other schools" refer only to other high schools, or to all other schools?

Applying to College Common and Coalition Application
1

Hi,
I attended no other high schools, but did attend different middle schools. Do I need to list middle schools under “other schools” or can I leave it blank?

Thank you!

2

only high schools (colleges if you have any)

3

Thank you! Does that include a college I dual-enrolled at? I can’t select the college (but it is written on my transcript).