What's a good song for an end-of-year high school concert?

Anything that can even remotely be related to school.

Each gender group gets together to perform their own act, and at the moment the girls want to perform a ‘sexy’ version of a Beyonce song, which I’m not comfortable with as I think the song should have a point to it, rather than just us shaking our stuff.

So just any suggestions would be greatly appreciated!
Thanks in advance,
Julia