great effort.may i know about what topic this quiz will be?or is it multipurpose?
I am not an expert, but here is my suggestion.
1. Keep your questions and answer options in a text file, seperated by special characters.(then we can parse them using StringTokeniser).
2. Display the questions in a panel and the answer options in a panel. Next to the answer options will be four(or the exact number) of radio buttons.
3. There will be a button, which pickes up the value checked and compare it with the correct value.
4. The score can be calculated after each question has been answered.
5. In future you can use threading for setting timelimits for each question and you can also add graphics like our javaranch cattle roundup quiz.
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Keep us posted about your progress.