Every Math test I would take in high school ended that way – “Pencils Down” – as though I had created some masterful creation that was perfect and could no longer get any better.
It was at this moment, when all hands were up that we’d look around at other people’s papers and either smile in agreement or become immediately dejected at having received the wrong answer.
When leaving jobs, this is the new “Pencils Down” – you’ve done all you can do, there is nothing left to give, you can’t change your answers.
Hand it in, move on, and be available for questions.
You can’t go back and change things.