WOW,,,,the stuff companies will do to get free labour and exploit staff......
I think it's illegal to be working 76 hours a week, even if you did sign a waiver, you do realize (of course you do) that you are basically working twice as many hours as the average joe almost....
I feel for ya brother, but this place is taking advantage of it's employees, especially students.....my sister in law had a similar thing going on as well, (accounting firm as well) until the labour board was contacted, then all this nonsense of working 80 hours a week stopped, everyone had normal hours, and anything over 44 hours was paid in OT, and yes her and all the others signed a waiver as well, it didn't hold up, once the labour board was involved....
good luck to you, hope you survive, and fortunately tax time is not a long time......