This was made known by the NECO Registrar/Chief Executive, Professor Dantani Wushishi, during a briefing in Minna.
Wushishi said NECO blacklisted twenty one supervisors in twelve states and also de-recognised one school in Ekiti state for mass cheating in three subjects.
According to NECO, one million three hundred and seventy six thousand, four hundred and twenty three candidates registered for the examination out of which one million, three hundred and sixty seven thousand, seven hundred and thirty six eventually sat for it.
Meanwhile, eight hundred and twenty eight thousand, two hundred and eighty four candidates, representing sixty point five five per cent, made five credits in English and Mathematics.
