I'm not familiar with your school or St. Bernard, but I can tell you how I used to get around the old firewall at my school (This probalby only works on really old security systems and blockers):
Go to the comand prompt and type ping <url>, then type the IP of the website into the address bar.
If that doesn't work, have you tried using something like
anonymouse? BEWARE: They probalby get funding from Pornographic and Adult themed sites, so use at your own risk.