Quizzes - Allowing students to select from a group on launched quiz. 

I have been a long time user of Canvas. My one problem is how to provide students choice in selecting short answer questions without having Canvas indicate that all questions are being counted. I give my students a choice on the short answer question of the quiz. They receive 8 questions, but only have to answer 5. Basically Canvas counts all the short answer questions as needing to be answered so the points possible is always overstated by 30 (the 3 additional questions X 10) which throws off their percentage grade, not only for the test, but also for the term. 

Is there some work around, or can I "trick" Canvas into providing students a choice of questions on an exam?

Thanks - Dr. Lisa Augustyniak - augustyn@lakemichigancollege.edu