Anecdotally, with respect to law school, I can share the experience of one of my daughter’s friends. She is bright and hardworking and before her graduation from a not particularly competitive state university, she did a mix of home schooling and public high school for her last two years. She took the LSAT twice but I don’t remember her scores. BS degree in biology. She now has substantial merit offers (full tuition or more) at BU, BC, Georgetown, and a couple of others I can’t remember. I can assure you that UIUC is much more highly ranked than where she attended.
Assuming you do well at university, wherever that may be, and on the LSAT, I don’t see any reason why you wouldn’t have similar opportunities.
As for the money, I’m a random stranger on the internet, but here goes. I see a couple of options for you. 1) go to Illinois, graduate debt free, go to law school 2) go to Yale, graduate with 85K in debt and then A) work for a couple of years in a high-salary field to pay it off and then go to law school B) go to law school immediately and delay payment of loans (assuming your folks are willing to wait; the government will if you are in school continuously).
As already mentioned - 85K of debt will constrain your career choices somewhat. If you want to work in the non-profit sector, for example, your debt obligations wouldn’t permit it. Summer earnings, of course, might mitigate the debt somewhat.
Back in the 1980s, I had a similar choice - state flagship with honors for free or prestigious LAC that would have meant about 35K in personal debt. I chose the flagship. But had the alternative been Princeton or Yale, I might have made a different choice. The flagship offered a perfectly fine education and I had a choice of several fully-funded prestigious options for graduate school. The honors curriculum was challenging and I met interesting people and made lifelong friends. But I wouldn’t say that it was a total heady “life of the mind” experience. If you seek that experience, it might be worth assuming the debt. If you’re seeking a prestigious name on your diploma as a stepping stone to grad or professional school, maybe not.
Also to consider, as your siblings enter college, if there is overlap, your family’s financial profile might change such that you’d be eligible for more aid, perhaps in the form of grants rather than loans.
Lots to think about. But hey, you got into freakin’ Yale! Congrats.