In that level of schooling, students study a general curriculum covering a variety of subjects. That being the case, the most sensible answer to this question is something along the lines of "general studies."
The people responsible for hiring realize that this schooling covers everything from reading and science to art and history. They certainly don't expect you to list each and every subject in the minimal space you are given on your application.
talldivaofbeverlyhillz answered Friday June 13 2014, 1:15 pm: It basically means the general education that you took in high school and understudies. When filling out that application, just write "general" or "general studies", it's what I have always written.
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