You're writing a cgi-script to give a quiz?

Sorry to be a wet blanket here, but have you considered what happens when:

• A quiz taker clicks the reload button, over and over?
• A quiz taker clicks the back button (maybe more than once), then submits a new answer?
• A quiz taker clicks the back button, then the reload button?

If any of these possibilities give you trouble, consider using CGI:Session to maintain state, and save state data server-side in a database like mysql.

ps: if you think this is easy - you're doing something horribly wrong.