Retry Quiz Button: My questions are scattered throughout my course, but I don't want my learner to redo the entire course.

I have set up quick knowledge check questions after each section of my storyline. If the learner has failed the questions (there are 6 in total with an 80% passing score), they need to retry them. My issue is that when you click "Continue" after a submission, it takes you to the next slide. While that's normally great, on the 2nd go-around, I want them to only retry the questions, not all the content. 

I have researched other forums, but the answers are from previous versions of storyline or the discussion itself isn't clear (or missing content). What variables/triggers/buttons can I create or show to manage this? For context: I have tried to set a "revisitslide" True/False variable & a hidden button (that should only appear when revisiting the slide but it's not showing up either), but I'm not getting to where I need to be. Any assistance would be appreciated!