chondro48
Any question that you did not submit is not counted, thereby reducing your overall scaled score in that section.
The magnitude of the score reduction depends on the difficulty level of that question as gmat is computer adaptive.
That is not the case. If you leave a question unanswered, the penalty does not depend at all on the difficulty level of that unanswered question. The difficulty level of a question only matters if you choose to answer the question - then if the question is easy, and you guess wrong, you'll be penalized more than if the question is hard. For that reason, it can sometimes be better not to finish the test than to guess randomly at the end, though statistically, that tends generally to be true only for low-level test takers. High-level test takers should finish each section, even if that means they need to guess to do so, though if we're taking about just one question at the end, it's not going to matter much for anyone.