I am in college, I'll be graduated next year. And yes the illegals I know do go to school for free, they can qualify for grants. Look I up. As for the last part, sure it's been illegal, but it isn't really enforced. I know illegals who work at random places. Jack in the box hires them for sure. I'm saying to actually jail employers who do it and they'll quit.
Edit: they qualify for state grants and some scholarships, my ex b4 I found out was illegal somehow completed her degree without any debt and I always wondered how. She was working for her uncle getting paid like 6 dollars an hour under the table.