The purpose of the study was to evaluate an education program at the high school level for financial literacy skills mentioned within the framework of general competencies and test programs' effectiveness. A mixed-method to obtain data diversity was employed in the research. In the quantitative part of the study, an experimental approach was used, while in the qualitative part, the case study method was benefited from. Within the scope of experimental design with the pretest-posttest control, in the quantitative dimension of the study, "Financial Literacy Behavior and Attitude Scale" was used. In the qualitative dimension of the research, the opinions of voluntary students in the experimental group about the training were determined through an interview form. As a result, financial literacy program developed for high school students positively affected their financial attitudes and behaviors. The significant difference between the students in the experimental group and control group indicates that the outcomes aimed by the literacy training program were achieved. In addition, the results obtained from the qualitative part of the research show that the student's perception of money changed, that the program positively contributed to their lives, and that they wanted to receive the training at their early ages. Based on the study results, it is recommended for policymakers to systematically involve financial literacy education in schools.