I would figure this out immediately, contact the schools to know. I am from WA and went to Utah for school. Everything I have is still connected to WA but I had to get a Utah drivers license while here. I called WA just to make sure I would be considered a WA resident and they said that I needed to change my license back to WA immediately or I wouldn't be considered a resident when I enrolled.
I would think that the state you are originally from is your best bet for residency, but keep all ties like drivers license, car registration, and a valid address. Most states you move to just for school will not consider you a resident. Most states require you to have tried to start residence and have employment there for a couple of years. Also things like buying a home, drivers license, car registration etc. And living in a dorm and working on campus part time probably doesn't count haha.
This is just my experience with residency, hope it helps!