I've posted some quizzes for the students to use both as exam prep and bonus points. THey are completely optional. I assumed they had to be graded quizzes as opposed to practice quizzes so I'd know the students' points earned. One student took the quiz, got 10/15 and her total grade percentage for the course lowered as a result! I don't want these quizzes to have a negative impact on their course grade. I only want to add the total points earned from the quizzes to their total points. How can I accomplish this?