Submit button not working properly

I made a couple of simple changes, and I think it works the way you describe what you want. The learner answers all the questions, then goes back to retry only those they missed.

Select Q1, Q2, and Final Assessment slides, and Preview selected slides.

If that is what you want, go to Q2 slide, and on each of the layers, change the "Jump to ..." trigger to "Jump to Q3".

I only changed Q 1 and Q2, so you will need to change the others to match.

On Q1, there were duplicate layers, and I deleted some of those. On all slides, be sure that the "Jump to ..." trigger is below any other triggers.

Oh, I also made Q1 so that clicking on the colored spot beside the button also selects it. Just my personal preference as a user.  I also set all the feedback layers to hide base objects.

Any questions, ask.