Career information services are widely implemented in secondary schools to support students’ career decision-making; however, empirical evidence regarding their direct effectiveness remains inconclusive. This study examines the mediating role of career maturity in the relationship between career self-efficacy, parental social support, career information services, and career planning decisions among senior high school students. A quantitative cross-sectional design was employed with data collected from 200 students through validated and reliable questionnaires. Path analysis using LISREL was conducted to test direct and indirect effects. The findings reveal that career self-efficacy, parental social support, and career information services significantly predict career maturity. Career maturity shows the strongest direct effect on career planning decisions. Notably, career information services do not directly influence career planning decisions but exert a substantial indirect effect through career maturity. These results suggest that providing career information without strengthening students’ career maturity may limit the effectiveness of career guidance programs. This study contributes to career development literature by empirically demonstrating the central mediating function of career maturity in adolescents’ career decision-making and offers practical implications for school-based career guidance interventions.
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