Yes, candidates can experience meaningful variation in how difficult or quantitative Casey feels. The practice case is useful for learning the format, but it should not be treated as a guarantee of the exact difficulty of the real assessment.

What you can control is the process: identify the question being asked, isolate the relevant data, set up the calculation cleanly, and avoid trying to use every number shown.

Do not assume a difficult-feeling case automatically means a poor result. The assessment is evaluated as part of the broader process, and candidate perceptions of difficulty are not always a reliable indicator of performance.