Education Cabinet Secretary George Magoha on Saturday cancelled the results of 441 KCSE 2021 candidates due to exam irregularities.
Other cases were collusion (6) and causing a disturbance at the examination room (1).
Magoha said ahead of the 2021 KCSE exams, the Government heightened measures meant to pre-empt any forms of cheating through the combined efforts of all the members of the Multi-Agency Team.
The Cs said the result of this enhanced vigilance was that nearly all the cases of cheating that would have occurred were prevented.
"The country would bear me witness that many mobile phones that would have been used to relay preexposed examination materials were confiscated before they could be used," he said.
"I wish to categorically state that KNEC will not have any mercy on examination offenders who must be dealt with decisively."
This represented an increase of 79,646 candidates (10.66%).