Exercises that are dead/unmaintained:
Note that all expressions of quantified confidence in beliefs can be well- or poorly- calibrated. For example, calibration applies to whether a person'person's 95% confidence intervals captures the true outcome 95% of the time.
List of Calibration Exercises
(From: https://www.lesswrong.com/posts/LdFbx9oqtKAAwtKF3/list-of-probability-calibration-exercises)
http://www.2pih.com/caltest/