ONLY Illinois students can apply for state aid but are still not eligible to apply for FAFSA.
For tuition purposes, an undocumented student, then tuition is assessed as a non-resident of Illinois. If the student meets the requirements of the Acevedo Bill (IL Public Act 93-0007) which was passed in 2003, the student may qualify for in-state tuition.
Look at your state's resources for undocumented students. Some states may be more welcoming than others and states may only have resources for the students that have graduated from high schools in those states.
It does not affect their application status, but it is used to determine resident/non-resident tuition.
95% of our scholarships are open to undocumented students, however, they must be Illinois high school graduates.
The University does have an office that works with providing students with resources: The Undocumented Student Resources Office but anyone in the Admissions Office can answer students' questions.