I'm looking for a manga, forgot it's name...It's about a girl who joins a rich school for serious studying, but she is lucky enough to win the draw and get to share the room with the student council president(i don't remember clearly but he is a prince for the whole school). Turns out he is two-faced, and has a horrible personality. And the girl want to get out, by all mean, but can't, ends up with her first kiss being stolen.

And if you know any manga that has similar plot then please be kindly enough to recommend them to me.
Thanks in advance.

It's probably not what you are looking for, but I think it's similar: Tenshi ja Nai!!

You're so cool is somewhat similar to this as well.

Houou Gakuen Misoragumi was something like this, I think. Er, only goofier. Probably.

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They say it's the thought that counts, but then they tell you, "The road to hell is paved with good intentions......"

Will no one scanlate Takahashi Miyuki?! T_T

Although it's not what you are looking for, it's somewhat of the same storyline-- Love Monster

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The manga you're looking for is S Kareshi Joujou

Another one similar to that is S.L.H - Stray Love Hearts!. It's probably not what you're looking for but it's worth reading