Federal funding could be at stake as Common Core testing problems continue in Nevada, Montana and North Dakota.

The states contract with the New Hampshire-based Measured Progress to administer the tests, which are linked to the hotly disputed, federally-backed education standards.

A coding issue in March caused delays and an ongoing server problem first stopped testing on Tuesday.

The trouble prompted Montana to offer school districts the option to opt-out of the mandatory test this year.

North Dakota schools may use the paper version of the test, but officials also say the state is prepared for any consequences.

The U.S. Department of Education maintains that states are responsible for the compliance of at least 95 percent of all students, saying it hasn't had to withhold federal funding yet.