Saving data across frames

Ok here is my situation. I’ve developed a quiz application. Their is 30 frames. 2-29 is the presentation that contains the answers. Frame 30 has the quiz on it. When the user hits submit (once theyre all answered) and if their are wrong answers, it does not continue and it highlights the wrong questions and sets some _visible = false buttons to true. The buttons say “Review answer” which is going to take them back to the frame that has the answer and once that review is over it goes back to frame 30.

My problem is that when the user returns to the quiz frame, everything is reset. How can I store what the user has already selected so when they come back to frame 30 everything they filled out is still their?