Rush.

no they don’t matter nessacarily for the first round but some sororities will be very hesitant to invite you back after that unless if your recruiters really loved you. unless if your gpa is under a 3.2 almost all sororities except gphi and chi o aren’t too worried about it.

also yes some dirty rush. there are occasional accidents at every sorority but the ones notorious for it are chi o and axid.

Not as important after the first round but it is a factor in later rounds. If you have at least a 3.5 you shouldn't have any problems with houses dropping you based on gpa other than Chi O and Gphi (notoriously known for only taking really smart girls) if your gpa is closer to a 3.0 or lower you may get cut from some other houses. However there are still houses like tri delt and aop that will take like any high school gpa. Hope that helps!