Button change on result slide only if the pass percentage is at 80
I would like to create a button on the results slide that sends the students to a Google form that they can fill out. I am going to keep the form embedded in the storyline file. So it would go results slide then the next slide would have a Google form embedded. I am having trouble wrapping my head around how to disable the button that will send the students to the results slide only if that have a passing score of 80%. If they do not have a passing score they will need to redo the module until they do. I would like the button to say disable until they have that 80%.
Is there a way to do this and does this make sense.