They make sure they get all assignments they missed and understand specifically what was covered in class. Successful students speak in class, even if their attempts are a bit clumsy and difficult. They ask the questions that the instructor knows many in the class are bound to have, provided they are listening. They see the instructor before or after class about grades, about comments made on their papers, and about upcoming tests. Sometimes they just go to ask a question or make a comment relative to the class discussion.
Successful students turn in assignments that look neat and sharp.
They take the time to produce a final product that looks good, a reflection of a caring attitude and pride in their work. They are attentive in class. They don't chat, read, or stare out windows. In other words, they are polite and graceful, even if they get a little bored. All work assignments are turned in, even if every one of them is not brilliant.