class vs grade in Korean
수업vs급
수업class
수업 (class) means a lesson or class time at school or an academy. You use it when talking about studying with a teacher, like an English class or math class. It can mean one class today or classes in general.
When to use class
급grade
급 means a grade or level. It is often used with a number, like 1급 or 2급, to show how high or low a class, test, or skill level is. In school and study situations, it helps people talk about course levels, exam levels, or certificates.
When to use gradeHow they differ
수업 means a lesson or class that you take. It is the activity itself, not the level number of the class.