The Ceiling Probe
A reading of the room, not a score.
A full test is 2 hours 14 minutes. Before you commit to that, this is a much shorter way to find roughly where you stand — a boundary between what you solve reliably and what's still a coin flip.
About 15 questions, roughly 20 minutes.
Each question adjusts based on the last — this converges on your ability boundary far faster than a full test can. Pick a section to start.