Do you actually have a W-2 or do you have something else---a 1099NEC? It is unusual for a school district not to withhold federal tax unless you are some sort of independent contractor doing work for the schools. Some districts might pay substitute teachers as independent contractors, etc.
https://turbotax.intuit.com/tax-tips/irs-tax-forms/what-is-a-w-2-form/L6VJbqWl5
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