New member here! But need urgent help, with some circuit problems. I have a final in 2 weeks!

Circuit:

https://docs.google.com/open?id=0By2PVt4Tdl6VZjNmMGRmODgtOWVmYy00MTUxLWExNjItZmQ4MTMxMzYyZDAy

I have to solve for Vo using Thevenin's Theorem.

I dont know how to break apart the circuit, I tried just removing the 1kOhm resistor and trying to find V(Open Circuit) and R(thevenin) but I couldnt solve for V(OC).

Thanks in advance,

C25