This cluster randomized controlled trial evaluates the effects of a yoga therapy program grounded in the Neuman Systems Model on test anxiety, quality of life, and mindfulness among eighth-grade students aged 13-14 years in Denizli, Türkiye. The study was conducted with students preparing for the national High School Entrance System (LGS) examination. A total of 166 eighth-grade students were allocated to intervention and control groups at the school level. The intervention consisted of a structured yoga therapy program delivered once weekly for four weeks. Outcomes were assessed using standardized measures of test anxiety, quality of life, and mindfulness at baseline, mid-intervention, and post-intervention. The study received ethics committee approval, institutional permissions, and written informed consent from parents or legal guardians.