A scored quiz works based on a total score that a quiz taker gets as they go through a quiz. Every answer choice to every question has a point value associated with it, and the outcome of the quiz is based on the total point value that a quiz taker gets.
There are two settings for scored quizzes, on the questions and on the results.
First, click "Set Answer Scores" for a question
Then, add a point value to each of the answer choices as you'd like for your quiz
First click "Result Settings" in the top right corner of a result
Now set the score ranges you'd like for each of the outcomes