Quiz not scoring wrong answers

The Quiz Results variables that are built-in are the problem. With the unlimited attempts there is no way to fail the quiz. 

I created a custom variable to track correct and incorrect responses, Cumulative_Score. This value adds 1 for a correct response or subtracts 1 for an incorrect response. 

Then, on the Results page, I changed the variable that displays the user's score to the custom variable (Cumulative_Score).

I also changed the triggers that show the Failure or Success layer. I changed the Quiz.Score.Points variable to the custom varaible Cumulative_Score

For example:
Show Layer Success 
When the timeline starts on this slide 
If Cumulative_Score is greater than or equal to Quiz.Pass.Points

That seems to deliver what you are looking for and still allows the LMS to track the quiz if you want (even though no one can fail).

I put the 2 variables on the base layers so you can see how Storyline treats the two variables differently (Cumulative_Score and Quiz.Score.Points). See attached.