You have to ask your parents. If they don't remember, they can look at their past returns. If they don't have copies, free transcripts from the IRS will show the education credit. There is a fee for getting copies of actual tax returns from the IRS.
See https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-get-a-copy-of-a-return-i-filed-thi...
https://www.irs.gov/individuals/get-transcript
