When to use aptitude in Korean
Korean: 적성[ jeok-seong ]

When to use it
Aptitude (적성) means a natural ability or a good fit for a certain kind of study, job, or activity. We use it to talk about what someone is naturally good at. In school, people often talk about a student’s aptitude for subjects like math, art, or science.
Example sentences
학교에서 적성 검사를 했어요.
We did an aptitude test at school.
선생님은 제가 수학에 적성이 있다고 했어요.
The teacher said I have an aptitude for math.
집에서 엄마와 제 적성 이야기를 했어요.
At home, I talked with my mom about my aptitude.
우리 언니는 미술에 적성이 있어요.
My older sister has an aptitude for art.
서점에서 적성 검사 책을 샀어요.
I bought an aptitude test book at the bookstore.
여행 안내 일은 제 적성에 잘 맞아요.
Tour guide work suits my aptitude well.