Good Luck to you. I took public speaking in college last semester and as a stutterer myself it was a pretty nerve racking experience. I actually did very well throughout the whole class though and hardly stuttered at all during any of my speeches which seemed like a miracle to me at first. The more I think about it though, I think one of the main reasons I hardly stuttered while giving my speeches for this class was because I was more worried about the content of my speech, citing sources, and everything else required in order to get a good grade. So instead of worrying about whether I'd stutter or not, I was worried about all of the other aspects of my speech. So I guess the best advice I can give you is don't spend the rest of the time leading up to your interview worrying about stuttering and instead worry about things like what kind of questions they're going to ask, what you've accomplished and why you deserve the scholarship, and anything else your average fluent speaking person would be worrying about instead. Worry about those things instead and it may have the same effect on you that it did on me.