BOISE, Idaho -- A new report takes aim at the nation's largest for-profit online education provider and finds students taking K12 Inc. classes in Idaho and four other states are falling further behind in math and reading than their traditional school counterparts.

The study was released Wednesday by the National Education Policy Center at the University of Colorado Boulder. Along with lagging test scores, the report says the rate at which K12 students graduate on time is far lower than in regular schools.

K12 contends the study is flawed and fails to show the academic progress of students.

Nationwide, more schoolchildren than ever are taking classes online.

The debate over virtual learning has become heated in states like Idaho, where students have to take at least two credits online to graduate high school.

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