what are the real sorority rankings here?

Top Tier- Alpha Phi. Sorority with the hottest girls
Middle Tier- Chi Omega. Very academically strong, and still very sought after. More academic and refined than alpha phi but less attractive
Botton Tier- Alpha Omicron Pi. Probably the friendliest people but unfortunate..just unfortunate

You're wrong. Chi Omega doesn't have the strongest academics of the three.

Top tier=Alpha Phi the best looking, funnest, most outgoing. Everyone who's not in a sorority would say it's top tier, but it also has a reputation for being mean, wealthy, and exclusive.
Mid tier=Chi O have really big pledge classes and it's the girls who don't fit into APhi or AOPi so it's kinda the random sorority. Overall pretty good, nice reputation.
Bottom tier=AOPi Don't really have a social presence on campus. Less attractive, nerdy girls. Probably the best reputation with the administration, no hazing, drinking, etc and they probably have the strongest sisterhood.

top- aphi: aside from being the most attractive, they are also really fun to hang out with. some may say they're into themselves but that is only because they truly like each other. not all their friends are within their sorority, and they aren't obsessed with being your typical sorority girl. they go out a lot and have fun together, like sisters should.

mid- chio: like someone else said, many extremes. some of these girls are psycho (in not a good way) while others don't even go out. because of this, there is a lot of animosity within the group, which really shouldn't happen in a sisterhood. they love portraying that the love their sorority by wearing letters but lets be honest, this is tufts and not many people are into that. if you want to spend 6 hours at a meeting doing elections, join chi o.

low- aopi