schoolgirl vs high school student in Korean
여학생vs고등학생

여학생schoolgirl
A schoolgirl is a girl who goes to school. In Korean, 여학생 means a female student. You can use it when talking about a girl at school, in class, or on the way to school.
When to use schoolgirl
고등학생high school student
A high school student is a student who goes to high school. In Korean, this word is 고등학생. You use it to talk about a teenager’s school life, age group, or daily activities. It is a common word in school and everyday conversation.
When to use high school studentHow they differ
여학생 means a female student, so it tells you the student's gender. A 고등학생 tells you the school level instead.