You really need to report the 1098-T as it is. The IRS also gets a copy. If you think there is an error, contact the school and inquire about a corrected 1098-T.
The 1098-T is issued based on a calendar year not a school year. However, it is possible that Scholarships (box 5) and Tuition (box 1 or 2) included amounts for 2018. Note whether box 7 is checked. Box 7 indicates amounts billed/paid were for 2018