I know a bunch of kids at Berkeley and one of my friends was in your exact same position (rushing as a sophomore) this year. Apparently there are two or three houses where being a sophomore really hurts you and these houses essentially require that you know a sister well in order to get a bid. For the rest of the sororities, however, it doesn't matter. She ended up in one of her top choices with a lot of different sororities to choose from.
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