I'm occasionally asked questions about Processing and High School education. I don't personally know anything about it, but there have been some initiatives in teaching Processing in this context and here are a few pointers:

The Learning Community Group
http://www.thelcg.com/processing_gallery.htm
http://www.thelcg.com/workshops/processing.htm

Martin Gomez, Xavier School
http://web.xs.edu.ph/courses/imas/
http://web.xs.edu.ph/courses/imas/exhibit/

I know someone was teaching Processing in the NYC public school system, but I can't remember the name or find reference to it.

Also, please keep in mind, there are more than a few active members on this board who are in high school or were in high school when they started using Processing. I won't reveal their identities here because they might not like people to know.  

Casey