how to rush for core four

Hi everyone. I'm happy to be attending Cornell this fall and want to be in a sorority. Checking around the internet, I see stuff about Core 4 being the top sororities (Delta Gamma, Alpha Phi, Kappa Alpha Theta and Kappa Kappa Gamma).

Do you have to know ppl to get in or is it a matter of looks or how rich you are? Are there events before recruitment to meet the actives? What is a good back-up group to Core Four??

I'm hoping to go Core Four so any help is greatly appreciated!!

Go Big Red!! Can't wait to be at this great campus this fall:)