For reference, we have included the entire single period (we didn't think it was fair on the borg to let them sit in on a double) lesson conversation:

*note: when the term "Borg" is used in the character column of this conversation - the entire class of borg is speaking at once, as they operate as a single conscienceness.

Teacher: Good morning class.

Borg: Morning is irrelevant, the life forms known as 'class' have been eradicated.

Teacher: Right, we'll take the register first, Adam?

Borg: Register is irrelevant, the life form formerly known as 'Adam' has been assimilated. He is now part of us, everything he didn't know, the borg now don't know. Resistance is futile.

Teacher: Don't you *DARE* talk back to me like that, go and stand outside!

The entire class of borg get up and file out of the room.

Teacher: OK, that's your punishment, come back in. 

The borg file back in from the corridor outside, and stand behind their desks once more.

Teacher: Today we'll be learning about osmosis

At this point the borg go into regeneration mode (sleep), and prompty self destruct, taking down every borg in existence with them.

So there we are, a teacher single handedly destroys every borg in existence. Now we know what we should have done in films like Independance Day, First Contact, etc.