From the research I have done, most states require you to live there for 12 consecutive months with a non PO Box address, register to vote, maintain a full-time job and not be a full-time student. So basically, if you take a year off and work in the state you want to go to school then you can become a resident of that state. But if you are trying to attain residency while in school, it is very unlikely. Most schools will give you resident status after a year of you going there, but it is very rare they will change your residency status after you've been admitted. If you go to a public school sometimes they will make you a resident for tuition purposes, which allows you to pay in state fees, but you are not a true resident.