First, let's look at regular class at attendance. It sounds simple, but it's actually very important. Dr.Claude Olney did you one study of 800 students. He found that on average students who got As missed less than one class per term and people who get Cs missed more than four classes per term in class, teachers explain difficult ideas and make clear which information is most important Student-teacher discussion givesection an in-depth understanding that can't come from books. Attendance is even more important for doing well on testsome.