The 600 plus school districts suing Texas say the way the state pays for public education is "constitutionally and fundamentally broken."
State District Judge John Dietz declared more than a year ago that funding for public education is inadequate and unfairly distributed among school districts.
The initial decision came in response to the Legislature's cutting $5.4 billion in funding to classrooms in 2011. But last year, lawmakers restored more than $3.4 billion while easing high school graduation standards.
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Dietz reopened the case three weeks ago to hear evidence on how that might affect his initial decision.
During closing arguments Friday, school district attorney Rick Gray said "Band-Aid solutions" aren't enough.
Dietz will issue a final, written ruling on the entire trial after mid-March. That will be appealed to the Texas Supreme Court.