https://ttlc.intuit.com/questions/3402465-how-do-i-access-my-prior-year-2016-or-earlier-return
You can get a free transcript from the IRS:
https://www.irs.gov/individuals/get-transcript
How do I get a copy of a return I filed using online TurboTax?
https://ttlc.intuit.com/questions/1900748
https://ttlc.intuit.com/questions/3355524-when-does-access-to-my-prior-year-turbotax-online-returns-expire
Note: While you still can, print a copy of your current year tax return and save it as a pdf, too. That way you will have it when you need it for school, a loan, etc. without going through a lot of aggravation to get it.
FAFSA https://www.irs.gov/individuals/irs-offers-help-to-students-families-to-get-tax-information-for-student-financial-aid-applications
https://ttlc.intuit.com/questions/3389418-where-is-my-fafsa-fact-sheet