There is another very simple way to bypass the school's blocked list of websites.
This way will only work for websites that have steady url.
Steady url mean that once the video/audio begins it does not change its url during the video
or
that you do not have to go to another page after entering the url.
If the url is not steady, the content will be blocked.
The trick here is to add an "s" after the http.
If you want to access "http://www.google.com", you will actually enter "https://www.google.com"
Again, this will not work on websites like youtube since you have to divert to the video you want to see.
Have fun.