Well, not during the actual HSC exam. But for example, for an internal Ancient History assessment, I noticed in the morning (the exam was after lunch) that our teacher had the paper with her. So I talked to her to distract her, then slipped the exam into my bag.
I skipped class periods 2,3 and 4 and wrote my essay to the questions on the paper, and then took that in to the exam room and handed in my pre-written answers instead of what I wrote during the period. Came first in the form in that assessment.