Hey there! It could depend on a few things. First, a few background info: how manageable is your schedule this coming semester (as in how many classes are you taking)? Second, are you taking a few electives this fall or are you just getting into the core classes for your major?
A 2.8 is not bad, though! It's a very respectable B- (actually, a middle-ground B-...a 2.7 is the start of a B- I believe). It also depends on the size of the sororities. If sororities 2 and 5 each have, say, 90+ members, I don't think you should worry. They could have quite a few girls with GPA's around, say, 3.4-3.5, which averaged with a girl with a 2.7 or 2.8, would roughly bring the average GPA to a 3.1 or so.
Best of luck, I'm really pulling for you and hope you find your sorority! Please keep us updated!
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