You manage your own time. Most of your classes are arranged for you. You arrange your own schedule in consultation with your academic adviser. Schedules tend to look lighter than they really are. You will be expected to spend at least twice as much time on your studies as you spend in class.
Teachers carefully monitor class attendance.
Professors may not formally take roll, but they are still likely to know whether or not you attended. Classes generally have no more than 35 students. Classes may number 100 students or more. You are provided with textbooks at little or no expense. You are not responsible for knowing what it takes to graduate.