Abstract
This study examined the changes of grit, academic engagement, and
 academic achievement of adolescents in the 1st(year 2018) to 3rd(year 2020)
 data of KCYPS 2018. We also investigated how growth factors of grit and
 academic engagement would predict academic achievement directly and
 indirectly. Multivariate latent growth modeling was used to analyze data.
 Results demonstrates that growth rates of grit and academic engagement
 were not statistically significant, meaning that they were stable from first to
 third years. However, the growth rates of academic achievement was
 statistically significant. Happiness predicted 1st year’s grit, which in turn,
 positively affected academic engagement. Students who had higher initial
 status of academic engagement had higher academic achievement. Lastly, the
 mediating effect of academic engagement between grit and academic
 achievement was statistically significant.
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