Past exams available here (I looked at Math 2020, Science & English 2021): https://www.kice.re.kr/boardCnts/list...
CSAT: https://en.wikipedia.org/wiki/College...
A solution to Q15 (and more) from Mathflix:    • Korean College Entrance Exam Math (Ko...  
Asian Boss video on CSAT retakers:    • Taking the “Korean SAT” for the Third...  

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