Students frustrated over a new standardized test are planning school walkouts in protest across New Mexico.

Monday's backlash comes as millions of U.S. students start taking new, more rigorous exams aligned with Common Core standards.

In New Mexico, the Partnership for Assessment of Readiness for College and Careers, or PARCC tests, start Monday.

PARCC tests have generated controversy across the country, with many parents and students opting out of the exams. Others are lobbying lawmakers and education officials for change.

New Mexico Education Secretary Hanna Skandera defends the exams, telling the Santa Fe New Mexican (http://goo.gl/G7cxFa) in an interview that much of the concern about the tests is based on misinformation.