Reports of malpractices in the completed Primary Leaving Certificate exams in Western Bahr El Ghazal State were likely to undermine the credibility of their results.
There were reports that supervisors were not doing enough to control pupils from entering classes with extra papers in designated centers, Voice of Hope reported.
One of the supervisors who asked for anonymity revealed that some school head teachers were made chief invigilators at their schools leaving supervision.
The supervisor also remarked that pupils were allowed to enter with external materials for the first forty minutes.
The exams which started on Wednesday concluded on Monday.
Voice of Hope could not access exams authorities to verify the claims.