App inventor quiz app enhancements

I need to make it so that my questions can't be repeatedly answered using a true/false list, but it doesn't seem to do anything. Could anyone provide examples of what this should look like?

Search this board for 'Quiz', or show us your blocks.

I don't know which blocks to use so I don't really know where to start. I'll attach the aia file for what i have so far
QuizAppTemplate_2.aia (127.8 KB)

I would change


I missed this requirement.

To avoid repetition, add a new list called UnUsedIndexes, initially containing a list of 1,2,3,4 (the index numbers that you didn't ask yet.)

Choose your next index randomly from this list, if it is not yet empty.
After choosing an index value, remove it from this list.

See App Inventor Tutorials and Examples: Advanced Features | Pura Vida Apps