Some people say that Butterfly effect doesn't do justice to the real butterfly effect theory. I suggest you look into the background of the butterfly effect theory. You should be able to directly link it to Ray Bradbury's short story "A sound of thunder" - which was the inspiration for meterologist Edward Lorenz to develop the Butterfly effect.
this is an imaginative journey because evan goes back in time to relive his past and fix his future. "What if" takes hold of him.
Its a good movie for imaginative journeys, but you have to go into detail into the chaos theory to fully understand it - i woudn't recommend you do it in your HSC exam.