answer: Professor Smith advises Justine to download the notes from his web page and read them beforehand or read each chapter in the book before class.
documents: #Person1#: Hi, professor Smith.
  #Person2#: Hi, Justine, how are you?
  #Person1#: I am OK, but I'm doing badly in your class. I am wondering how to do better.
  #Person2#: I think comeing prepared class may do something to improve your grades.
  #Person1#: How can I prepare for class?
  #Person2#: Have you checked out my web page? All of my lecture notes are on my web page. You can download the notes and read them ahead of time.
  #Person1#: Really? Wow, that would be very helpful.
  #Person2#: Another good idea is to read each chapter in the book before class.
  #Person1#: I usually don't read the chapter ahead of time. I thought hearing the lecture first was better than reading first.
  #Person2#: Reading first is actually better. You should also write down ideas or notes while you're reading. That way, you can come to class with some questions.