Australian universities are mandated to implement non-academic on-entry evaluations for all initial teacher education candidates. Universities have introduced interviews, written applications, psychometric tests, and more recently, simulation. This research sought to determine if simulation as an evaluation tool had utility as a measure of teaching dispositions and its utility in measuring candidates' pre-existing dispositions such as self-confidence, resilience, and conscientiousness during and after a classroom simulation evaluation session. The mixed method design explored students' perceptions of the effectiveness of the simulation tool and evaluation of their own on-entry performance. The findings showed that the utility, fairness and validity of on-entry assessments of this entry requirement were justified and candidates' self-confidence as a distal measure of classroom preparedness was affirmed. The implications of these data and findings include the refinement of processes and tools for assessing non-academic teaching dispositions and an expanded evidence base for assessing the suitability of candidates for initial teacher education.