One of the Obama administration’s signature efforts in education, which pumped billions of federal dollars into overhauling the nation’s worst schools, failed to produce meaningful results, according to a federal analysis.

Test scores, graduation rates and college enrollment were no different in schools that received money through the School Improvement Grants program — the largest federal investment ever targeted to failing schools — than in schools that did not.

The Education Department published the findings on the website of its research division on Wednesday, hours before President Obama’s political appointees walked out the door.

“We’re talking about millions of kids who are assigned to these failing schools, and we just spent several billion dollars promising them things were going to get better,” said Andy Smarick, a resident fellow at the American Enterprise Institute who has long been skeptical that the Obama administration’s strategy would work. “Think of what all that money could have been spent on instead.”…