> It's basically a "9 points for a correct answer, 0 for anything else" test that simply starts with a score of -4 N.

But it's not. Skipped questions before your final answer get a bad score, while skipped questions after your final answer get a medium score.

If you take a blank test and answer the last question only, your score drops by hundreds of points.

No normal test does that. That's how it penalizes skipping around.