Hi Guys!!
First of all, I stumbled upon this manga years ago, really quite a while back, so my memory of the events of this manga is quite jumbled. Take this summary with a grain of salt!
Im looking for a manga about a girl being sent to a different school because of money problems but her mother was able to get her a scholarship to a school. Later did she find out that its was a delinquent school! Her dream of a typical good high school life comes to an end! And then on her first day I think she sort of got into an argument with one of the students about shes just like the other people judging them by their looks or something. I think one of the male characters were wearing a typical delinquent mask. LOL i know there are a lot of vague points but as I said, this was years and years ago! But I remember it was a good funny manga but I only got to read the first chapter/s. If you guys could help me out I will gladly appreciate it!

And no its not Oresama Teacher, Ah itoshi no bacnhou sama, Obaka chan koigatiriki..

Maybe Aa Itoshi no Banchou-sama

It sounds like Mamotte Agemasu.

If it's not that one, you can try taking a look to this old thread, maybe you find what you're looking for there.

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Maybe Shouri no Akuma?