Experience an advanced adaptive testing environment. Powered by Item Response Theory (3PL Model) and Elo Ratings, Thetamark adjusts question difficulty in real-time to precisely calibrate your skill profile.
The probability of answering correctly scales according to the curve above. If you answer correctly, difficulty rises ($\theta$ increases); if you answer incorrectly, it drops. The engine picks questions centered near your current ability to maximize measurement speed and accuracy.