How do I add new levels for mastery paths?

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I'm trying to use mastery paths to simulate the conditional release that I would have used in Blackboard.

I have students take a pre-quiz that then directs them to one of four exams based on the results.  In Blackboard, I would have created settings on each one of the four exams to be visible/open up if the pre-quiz had a score of 1,2,3,4 (for instance).  

In Canvas, it seems that the correct way to do this is to use Mastery Paths on the pre-quiz that then unlock the other exams (although I can't figure out how to hide them while locked).

The problem is that I have four separate exams, but only three score ranges for Mastery Paths.  I guess I'm blind, but I can't seem to find the button to add a new entry.

What am I doing wrong?