MILLBRAE, Calif. — The College Board and Educational Testing Service has invalidated more than 200 Advanced Placement tests at a San Francisco Bay Area high school due to "seating irregularities."

The College Board says Mills High School in Millbrae failed to follow protocols during the administration of 11 exams to 224 students in May.

The San Jose Mercury News reports (http://bit.ly/13TgRdc ) the protocols cover seating, including the distance between desks, the direction students face, and the size of tables at which more than one student is seated.

A spokesman for the board, Tom Ewing, tells the newspaper some students may have gained an unfair advantage. But he didn't immediately respond to a question about whether there is any evidence of cheating.

The school is demanding College Board reinstate the test scores rather than re-administer the tests next month.