South Korea implemented many-pronged educational reforms, notably to transition from heavy reliance on a high-stakes standardised test to more diversified assessment for university admissions. Nonetheless, this effort created another arena of competition towards meritocratic credentials--such as academic publications. The South Korean government, in 2014, prohibited high schools from documenting students' extracurricular accomplishments earned outside schools. This paper analyses the impacts of these reforms. We queried large-scale bibliographic databases with prestigious high schools' names in South Korea and retrieved publications where high school students were granted authorship between 2001 and 2021. We examine associations between school types, research topics, and the status of scholarly venues. We also show the number of papers from Korean high schoolers rose until the mid-2010s but declined after the 2014 intervention. Our findings suggest that diverse adaptive strategies can evolve as long as meritocratic ethos persists. We discuss further implications beyond the context of South Korea.