The purpose of this secondary school-level longitudinal study is to examine students' academic growth and subjective well-being. On average, 476 students (all from academic-track schools) will be 16 years old when they take the first assessment in eleventh grade. Using controlled processes carried out in classroom settings, data will be gathered at several time points. Subjective well-being, socioeconomic position, IQ, personality attributes, and parental participation will all be measured using standardized tools. Cognitive and emotional aspects will be used to evaluate subjective well-being, while personality and IQ will be measured using recognized psychological exams. Additionally, the research will look at how academic ideals and parental encouragement affect students' final grades. We will use the Full Information Maximum Likelihood technique to deal with sample attrition and missing data. Key aspects impacting students' well-being and academic achievement over time are anticipated to be illuminated by the results.