British education officials say teachers at three schools were caught helping students cheat on a standardized test when kids gave the same wrong answer.

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The Qualifications and Curriculum Authority said investigators discovered teachers at one school had altered the SATS exams, curriculum assessment tests taken at the end of primary school, when 18 of 19 students gave the same wrong answer to a question, The Sun reported Monday.

A head teacher at another school was found to have personally changed students' exams, turning some right answers into wrong ones, and investigators discovered teachers at a third school had made 93 changes to student papers.

None of the schools were named by authorities.

Officials said the test results for the affected schools have been tossed. The tests are used to determine rankings in school league tables.