In a SL Pre-Check Quiz How Do I NOT Give Answer Feedback?

Storyline doesn't have a way to automatically turn the the feedback layers on or off based on whether the QB is being used for a pre-check or a final assessment. 

However, you could add programming to the question slides to make it look like there's no feedback layer during a pre-check. Here's the basic concept:

• Create a T/F variable to track whether the user is taking the Final Assessment or not. Give it a default value of False, meaning they aren't taking the Final. 
• On all of the Correct and Incorrect layers, add a trigger that hides the layer when the timeline of the layer starts with the condition that the variable = False. After that, add a trigger that jumps to the next slide when the timeline of the layer starts, with the same condition. 
• If that jump doesn't happen fast enough for you—that is, you see a flash of the layer—there are ways to deal with that. For example, you could also change the Initial State of all the objects on the layers to Hidden, and then add triggers to show them when the timeline starts with the condition that the variable = True. Another option would be to cover everything with a black shape, and trigger that to be Hidden if the variable = True. 
• On the Results slide, add a trigger that adjusts the variable to True when the timeline of the slide starts. 

As for using the same question bank for different quizzes, that's simply a matter of how you set up the draw. That info is in the User Guide: Storyline 360: Drawing Slides from a Question Bank | Articulate - Community