College is voluntary and expensive
You manage your own time.
You must balance your responsibilities and set priorities.
You need to review class notes and text material regularly.
Professors expect you to get from classmates any notes from classes you missed.
Professors may not follow the textbook. Instead, they may give illustrations, provide background information, or discuss research about the topic you are studying. Or they may expect you to relate the classes to the textbook readings.
Professors expect you to read, save, and consult the course syllabus.
Professors expect you to think about and synthesize seemingly unrelated topics.
Testing is usually infrequent, generally 2-3 tests per semester, covering large amounts of material. You, not the professor, need to organize the material to prepare for the test.
First tests are usually "wake-up calls" to let you know what is expected--but they also may account for a substantial part of your course grade.
You may graduate only if your average in classes meets the departmental standard--typically a 2.5 or B-.