During formal recruitment, sorority members are not allowed to talk to PNMs.
But that doesn't apply to you now.
It never hurt to have someone on the inside who is pulling for you. I came from a school with a large rush and no photos, and a lot of girls flew "under the radar" and got overlooked - they weren't invited back to parties not because there was anything wrong with them, but because not enough people remembered meeting them or could think of a positive reason to invite them back. This rarely happened to PNMs who someone knew.
We're not supposed to discuss how sororities make a decision on who to keep and who to invite back, but speaking from my own experience, there was very little nastiness and cattiness that non Greeks might fantasize about.
I'm not telling any secrets to say that there is a focus on what a PNM can potentially contribute to an organization "oh, she's in my major, and she's a real leader" or "she was really active in different organizations at my high school - she's not joining just for the parties". If you have someone who has gotten to know you from your dorm or classes, they can speak up for you, and remind the other girls of who you are and why you might be an asset. This may go some way in offsetting the handicap of your class rank.
And by the way, 4.0 (especially while participating in a major time commitment activity) doesn't suck
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