Figuring out how to complete a course

Hello everyone.  I have a course that I'm creating. It's non-linear with a launching page with 5 different topics. the learner will click on each topic and be taken through the content I've arranged in that particular section. I do plan on creating a quiz but we haven't gotten there yet. I need to figure out a way to prevent learners from starting the quiz before they've seen all the content in the course. Does anyone have any suggestions on how to accomplish this? I've attached a copy of the course in case it could help anyone. I've removed all the talk track information. The was a good amount of content in the notes as we were planning on doing this with a lot of voice-overs, just to provide some context. 

I'm using Storyline 3.