The Kenya National Examinations Council (KNEC) on Tuesday canceled results for at least 3,427 KCSE candidates.
The council announced that they had made the decision after intensive investigations on the 2018 tests.
In the exams, results from 53 centres in 16 counties were withheld over alleged involvement in examination irregularities.
KNEC Chairman George Magoha stated that the 3,427 candidates would be allowed to register and retake the national tests this year.
Magoha further announced that 1,275 candidates whose results had been withheld at nine centres were now cleared from allegations of cheating.
Releasing the results in December last year, CS Amina Mohamed stated that the candidates had registered an improvement in performance compared to the previous years.
There were 338,628 male candidates, while their female counterparts were 321,576. A total of 18 counties had more female candidates than boys.
A total of 315 candidates scored straight As in this year's KCSE. The candidates who attained minimum university requirement grade of C+ and above rose to 90,377 an increase from 70,073 in 2017.