True/False questions are scored very simply--if you get it right you get 100%, otherwise you get no points.  Multiple choice questions are scaled according to how soon you correctly choose the right answer--100% on the first attempt, 75% on the second, 50% on the third, and 25% on the fourth attempt.  No points are awarded for choosing the correct multiple choice answer on the fifth attempt.  The scores from each question are averaged and the mean score is reported in the feedback section of the interface at the completion of each question.