How to tie a slider bar to quiz score?

Hi!

Does anyone know how to (or if I can) tie a slider bar to a quiz score? I'm trying to put together an unrestricted interaction where the learners can click the squares in any order they want, and if they miss points on any of the quiz questions associated with the squares, their meter goes down some. 

I really want it to be reflective of the overall course score - so cumulative across all the completed squares, so if someone misses 1 of 5 questions on one square, their score dips to 80%, but if on the next two squares, they get 5 of 5 on both, their score would rise to 93% (graphically, I don't need or want to show the actual score on the meter, but just show that they're in the green).