‘Evidence of malpractice’ has been found at an academy school tasked with raising standards at Addington High.
Exam board Pearson began investigating Ravens Wood School, which sponsors Addington High School, last September.
The Bromley school is now facing sanctions by the examiners.
There is no suggestion of any malpractice at Addington High, which became an academy and part of the Ravens Wood Learning Trust in June last year.
A Pearson spokesman said: “I can confirm our investigation has found evidence of malpractice at Ravens Wood School.
"Whenever we find malpractice in a school we act to impose appropriate sanctions and work with the school so no student is disadvantaged.
"This case is no different and we will be imposing appropriate sanctions on both the school and individuals."
No further details were given.
The Observer newspaper reported last September that the investigation involved allegations coursework marks of more than 200 ICT BTec students were changed before being handed over to the exam board.
A Ravens Wood School spokeswoman said: "The Ravens Wood Learning Trust has co-operated fully with the Pearson investigation.
"The Trust is aware of the sanctions imposed but have no further comment at this time."
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