In-State Tuition and Unauthorized Immigrant Students
In 1996, the illegal immigration reform law instituted a restriction on states' residency requirements and in-state tuition benefits for higher education, affecting an estimated 50,000-65,000 unauthorized immigrant students annually.
Last I knew that had not been repealed.
Also from the link....
The Illegal Immigration Reform and Immigrant Responsibility Act (IIRIRA) of 1996 (Sec. 505) sought to prohibit states from providing a postsecondary education benefit to an alien not lawfully present in the United States on the basis of residence unless any U.S. citizen or national is eligible for the same benefit. (P.L. 104-208). The Congressional Research Service notes that there is disagreement about the meaning of the provision, and there is no guidance in congressional report language or in federal regulations.