I think it was a manhwa but I'm not certain. It's about this girl who's competing with another girl to become the "queen" or something. There's this guy that likes the main girl while the other girl likes the guy. The other girl then challenges the main girl to some duel thingy... Yeah...

Way too little info.

Do you remember any major events in the manga? If so could you tell us what they were?
What do you mean by queen? Was it a manga that involves royalty? Or do you mean something like a female boss of a gang of delinquents?

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Feed your head.

Up until the duel thing, it sounds like Sugar Sugar Rune.

this might be a little too obvious, but could it be Girl Queen?

i did a quick search, and it seems to fit. it's a manhwa. two girls compete to be the queen of light. and the description mentions a guy. i haven't read this, but i hope this is it.

Yeap, way too little info.
Hmm...judging from the short descriptio you gave, It could be Ultra Maniac and the two suggested above.

i think its girl queen too. thats the first thing i thought of...

Haha, sorry, I couldn't really remember what happened
Thanks a bunch though! It was Girl Queen