Exiting a Randomized test

A lot of the Tests I create are fairly long. The main end users are at car dealerships and may not be able to sit though a whole test if a customer walks in. Problem is there is no exit button allowed during a random test, or at least, if you do exit, it is counted as a failed.Is there a way to work around this on a random test to allow someone to leave the test without getting a failed score sent to the LMS. Also, is there way to allow them to continue where they left off on a randomized test? I have managed to do this before using Docent Outliner, but I am trying to get away from using that software.

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