Thanks everyone.
I'm not doing anything special to it. When I'm not pulling my hair out from studying, I like to shampoo and condition it once a week. I oil my scalp with a homemade oil mixture. And I make sure my hair is coated with a good layer of conditioner or leave in while wet to finger comb it. My main styles are loose, ponytails, or buns.
I guess the biggest secret was finger combing and decreasing heat use to the minimum. I use heat every few months just to play with my hair.