I'm glad other people in this thread didn't do much maths during the test either, because I barely did any and didn't end up even needing the calculator. Was worried I'd made some kind of huge oversight.
I thought it was okay (I finished, at least) but what I wrote could have been far more organised, and I realised afterwards that I barely wrote anything in the way of a timescale apart from suggesting a deadline, which we were told to do anyway. Ah well!