Achievement tests are widely used to evaluate students’ academic performance. Critically, the validity of test scores depends on the assumption that students make a certain level of effort throughout testing, ensuring their responses accurately reflect their true abilities, which requires continuous engagement. Disengagement poses a serious threat to the validity of test scores by distorting psychometric properties and reducing measurement accuracy. This study examined the phenomenon of disengaged responding by testing the effects of self-report (SR) item placement and grading conditions on performance. It also explored individual-level predictors such as self-reported effort and response time. A two-way between-subjects factorial design was employed across two phases. Overall results indicated that the effects of SR item frequency and grading on test scores were not supported. However, individual-level variables—response time and self-reported effort—emerged as more reliable predictors of test scores. Recommendations and implications are discussed within the context of existing literature.
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