How to lock/unlock the access to the quiz at the end of the eLearning depending on if the learner visited all sections?

Hello all, I am developing a course (in Studio 13') with one single quiz at the end, but I want to allow access to it only if the learner visited all sections previously. The problem is that since the course is non-linear (learner can visit sections in the order they want)  and Studio does not have variables and triggers like storyline I cannot create that condition. This is my first course in Articulate so maybe I'm missing something,  but please let me know if you have a workaround or a solution for this. Thanks in advance.