There is a lot of misinformation on CASPer getting thrown out there so hopefully this will help clarify things.
CASPer is a Situational Judgment Test (SJT) that is NOT a pass/fail test like USMLE or MCAT. It is an assessment that RANKS large volumes of applicants based on their personal and professional qualities.
With the USMLE or MCAT, if you answer correctly, it doesn't matter what other people answered. With CASPer, responses are graded using a known Likert Scale. Your answer may be acceptable but that may still translate to a LOW/UNACCEPTABLE rank on the test because you are being evaluated AGAINST each other. In general, if you do not rank within the top 1/3, your application will not move on to the next round of review.
Doing well on CASPer is NOT a CRAPSHOOT. There are often no direct medical questions on CASPer and being yourself won't help you when you only have 5 minutes to type your answers. With only 5 minutes, it is next to impossible to "explore both sides" and responses that do so may be scored lower than those that do not. The best preparation for CASPer is NOT TO TAKE a prep course or pay for USELESS CASPer prep course videos. The best preparation for CASPer involves creating a study plan 5-6 weeks prior to your test date, reviewing your personal experiences, documenting examples from your life that show evidence to CASPer benchmarks and ultimately taking timed full length practice tests that are spaced apart to train your body and mind to adapt well to CASPer related content and themes. Weaknesses of SJTs like CASPer include the fact that responses can be improved through practice effects. Use this to your advantage to do well on CASPer. For those of you that believe CASPer is immune to practice effects, (ie. responses cannot be "faked" on SJTs), please see the research which shows otherwise.
As more schools adopt CASPer, it's weighting goes from being experimental to making the difference between getting an interview and ultimately receiving an acceptance. This is already the case for Canadian schools where CASPer has been used since 2010.
References:
Whetzel, D. L., & McDaniel, M. A. (2009). Situational judgment tests: An overview of current research. Human Resource Management Review, 19, 188-202.
Nguyen, N. T., Biderman, M. D., & McDaniel, M. A. (2005). Effects of response instructions on faking a situational judgment test. International Journal of Selection and Assessment, 13, 250-260.
Cullen, M.J., Sackett, P.R., & Lievens, F. (2006). Threats to the operational use of situational judgment tests in the college admission process. International Journal of Selection and Assessment, 14, 142-55.
Ebo K. A Osam (2014) The Adaptation of a Situational Judgement Test to Measure Leadership Knowledge in the Workplace, Western Kentucky University