I would suggest you use Yahoo or Google to search the web pages of a city you might like to go to, find the high schools in the city and write them. For example, click on url for Gdańsk's page:
It lists the vice-mayor for education's name, mail and email adresses. Seems to me, she could be a good starting point.
This url lists Rzeszów's mayors, doesn't give the titles of vice-mayors, so try the mayor:
Also try Warsaw: e-warsaw.pl/2/index.php?id=621