Last year, the state invalidated a series of questions on a Pearson-produced test about a passage about a race between a pineapple and a hare that was widely ridiculed.

WSJ: Testing Firm Is Under Fire Due to Errors Scoring School Exams

After results were released in April, parents helped unearth four errors made by test publisher Pearson PLC.

WSJ: New York City Gifted-and-Talented Program's Math Is Questioned

EdX, a MOOC affiliated with six schools including the Massachusetts Institute of Technology, has teamed up with Pearson Vue, a test-proctoring company.

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On Monday, highlights for Britain include Pearson in the individual freestyle test, Simmonds back in the pool in the 200m, David Weir on the track in the 1500m and John Stubbs defending his archery title.

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The city Friday said Pearson miscalculated students' ages after making mistakes on when some of them took the test.

WSJ: Testing Firm Is Under Fire Due to Errors Scoring School Exams

Knewton started with test prep, then moved into a partnership to deliver remedial education with Pearson for Arizona State University, and is now serving K-12 students who are in the juvenile justice system.

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Both Pearson and city officials expressed surprise that so many students made it into the 99th percentile under the new test, results that were nearly identical to the previous year.

WSJ: New York City Gifted-and-Talented Program's Math Is Questioned