navigation for a randomized test

i'm creating a test that should randomly pull 15 questions from a bank of 24. that's easy to setup, but i'm getting errors when i try to create cancel test/back/next navigation options for it. Lectora help is useless here and a quick search of the forum didn't turn up anything on it.can anyone tell me what're the best actions to use for this? goto/next goto/previous are giving errors.sorry of this is easy to fix or very noob, i'm under a deadline and feeling pressure right now! :)

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