you could sign up for one of the free web spaces like
http://741.com/ and
once you do type in internet explorer
ftp://www.thenameyoucameupwith.741.com then it should prompt you for your username/password if it dose not right click on it and hit "Login as..." then type in thenameyoucameupwith.741.com as the username and then your password then just drag your files in and when you get to school drag them out
note:the site in this exsample you cant put in mp3's so if you want to transfer those youll have to change the.mp3 to something else and then change it back once you get it where its going