@Anonymous
Your tax documents should be used to determine your tax liability. If these documents were not used or have different figures than what was used when you filed your return I would recommend filling an amendment. If you were not claimed by your parents you may qualify for the education credit.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-federal-tax-return-current-year/L7eS6o1qh_US_en_US
These documents should be kept with your tax return for that year in a safe place for at least 3 years from the date you filed the original return or 2 years from the date you paid your tax, whichever is later. Some situations require longer periods such as 7 years if you file a claim for a loss from worthless securities or bad debts.
https://www.irs.gov/businesses/small-businesses-self-employed/how-long-should-i-keep-records#:~:text=Keep%20records%20for%203%20years%20from%20the%20date%20you%20filed,securities%20or%20bad%20debt%20deduction.
