Before I started the assessment, I asked for the mark scheme to make sure my project hit the criteria for a passing grade. We weren't asked to build in powerpoint, but most opted to do so for lack of a better option. I asked if it would be a good idea to build an iPhone app for the assessment and the teacher of my class said "Sure if you can, give it a shot". I have no idea when the teacher became aware that the project would fail but at no point was a concern raised with me until final marking.
I didn't build a complex project 'just to be different', I instead thought "Well here's an opportunity to learn to do something I didn't know how to do before". Id been developing web things for a while but hadn't dipped into native code up until that point