Quiz Question Random logic

I make the index of question that have 5 question.then in the screen, i will make 3 question that call random from the index. And when the 3 question has correct answer, then the screen will mobe to another screen. How this logic? Plese help the built and step to make it :(

Did you do the tutorials, for example:

http://appinventor.mit.edu/explore/ai2/support/concepts/lists.html

and:

http://appinventor.mit.edu/explore/ai2/quizme.html

?

If yes, show us what you tried by posting your blocks. Only then can we help you.