{ "background": "Adolescent mental health issues are prevalent in urban South African schools, affecting both wellbeing and academic performance.", "purposeandobjectives": "To evaluate the impact of school-based mental health interventions on adolescent wellbeing and academic performance in urban South African schools.", "methodology": "A mixed-methods approach was employed, including pre- and post-intervention surveys for quantitative data collection and thematic analysis of qualitative interviews for qualitative insights.", "findings": "Pre- to post-intervention improvements were noted in students' self-reported mental health scores ($\Delta = -0.45 \pm SE{95\%} = (0.21, -0.68)$), indicating significant reductions in depressive symptoms.", "conclusion": "The findings suggest that school-based mental health interventions can positively influence adolescent wellbeing and academic performance.", "recommendations": "Schools should continue implementing these evidence-based programmes to support students' mental health and academic success.", "keywords": "Adolescent Mental Health, School-Based Interventions, Urban South Africa, Academic Performance, Wellbeing", "contributionstatement": "This study introduces a novel mixed-methods approach for evaluating the impact of school-based interventions on adolescent wellbeing and performance." } --- Pre- to post-intervention improvements were noted in students' self-reported mental health scores ($\Delta = -0.45 \pm SE_{95\%} = (0.21, -0.68)$), indicating significant reductions in depressive symptoms.