Unca, I think it more implies to the "unfinished" questions vs the ones you are working on. Not uncommon for these tests to have a few blanks, and the "guessing penalty"; I would assume, is to discourage "guessing" on those empty questions 30 seconds before the clock runs out. If there was no guessing penalty, you could move at your own pace and then christmas tree the back lot with a 25% chance of getting extra points.