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None of the threats were known to have been found to be credible, and many schools resumed classes, but national testing across Britain for the General Certificate of Secondary Education, or GCSE, was severely disrupted, school officials and British media reported.

“But the student has to sit for a physics K.C.S.E.,” he said, referring to the Kenya Certificate of Secondary Education examination.

In spite of his ordeal throughout 2013, the school achieved its best General Certificate of Secondary Education grades ever — roughly equivalent to the high school diploma in America.

On Thursday, thousands of English 16-year-olds got their results for a different exam, called the General Certificate of Secondary Education.

Their move on Friday came several days after Education Minister Michael Gove announced that the General Certificate of Secondary Education exams — currently taken by students throughout England, Wales and Northern Ireland at age 16 — would be replaced by an English Baccalaureate.