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The student needs to attend a school that provides Office 365 to faculty and staff. If they do, they can get use Microsoft’s Student Advantage Program to get a student license and free access. They need to have an email address with that school to prove they attend so they can get it, I believe. Also, they need to be 13 or older, which shouldn’t be an issue for a college student.
You can find more information at Microsoft's Office 356 for Students webpage. https://office.microsoft.com/en-us/office-in-education-FX104367920.aspx