I have work with a program called Financial Aid U which brings volunteers into the high schools to help students complete their FAFSAs, deal with verification issues and interpret/compare financial aid award letters. It is targeted to first generation/low income students who often don’t have a parent to help with the process but anyone can use the service.
I think that there are other programs like this around the country.
Its a great program but of course it relies on well trained volunteers willing to go in to the school.