You could use one T/F variable per pre-test question to track whether the user answered incorrectly (keep default value of False) or correctly (adjust variable to True). How you proceed with that info depends on the type of content and how it is organized.
For example, the content associated with each question could be put into its own scene. Those scenes could be accessed via a custom-menu slide. You could program that slide to require users to complete the scene(s) associated with the incorrectly-answered questions.
It's also possible to program NEXT buttons to skip certain content based on the specified condition(s), such as whether a T/F variable =True or =False.
It’s worth the effort to learn about variables and trigger conditions, because they provide the real power in Storyline. Here’s more info:
Here are some posts that might provide some additional guidance:
