Google Maps
not sure excatlly where you live so I did it from my job(near my house) so you'd have an idea where I'm coming from.
I used to make this drive. traffic is going to suck no matter what. MARTA will suck even more as buses get stuck in traffic too. not to mention you'll be @ the mercy of the buses schedule and with all the changes and shit it'll probably take 2x as long to get there.
really I'd try to get into Gwinnett Tech or GSU.