This - financially. Back to parents will pay half. UIUC is different in cost to USC. Are they truly paying half or up to a certain amount? Half of SC costs more than all of UIUC.
Find out what they are paying. Then find schools to fit in that amount.
You can’t afford to pay half of anything - and if you’re thinking loans, a bad idea, all YOU can get is $5500 in year one.