It's a little funny that you wanted to prevent spamming two-letter combos so you only accepted states/elements, but then you still gave us 6 minutes. It took me about a minute to just guess every state, and while I'm a relatively fast typist, I can guarantee the majority of people on this site can do the same in the given time, and probably much less. I might consider decreasing the time.
I don't know what answers you put in the quiz, but they're wrong.