JANESVILLE, Wis. (AP) _ Wisconsin school districts have spoken out against Gov. Scott Walker's recent call for a change in the state's curriculum standards.

Walker has asked the Wisconsin Legislature to pass a bill in January to repeal Common Core and replace it with standards set by the public.

Common Core is the set of curriculum standards that specify what is taught in grade-school classrooms throughout the state. Wisconsin adopted it in 2010.

School officials in Janesville, Milton, Clinton and other districts say they have invested time and money in creating curriculum based on Common Core, and abandoning it will be costly. Elkhorn School District administrator Jason Tadlock tells The Janesville Gazette dropping Common Core ``would be a step backwards.''

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