Como dizer "Perder conteúdo, matéria (na escola)" em inglês

If someone skips classes (or) he/she is likely to miss some subject or topic covered in the class, and that may (or may not) come up on some test. Some important piece of information, etc.

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There´s another way to see that, though. When someone skips classes, he/she may be "developing a work ethic that will serve you for the rest of your life." So, it´s not just about going or not going to that college and attending that class.
Plus, generally speaking, when you pay you go.
https://sites.ewu.edu/admissions/2011/0 ... ing-class/