A Singaporean tutor has admitted to helping six Chinese students cheat in their 2016 exams in what prosecutors say was an elaborate plot, BBC reports.
Tan Jia Yan took the exams as a private candidate and FaceTimed questions to accomplices who then rang students and read answers to them, prosecutors say.
The students snuck in mobile phones and Bluetooth devices, and wore skin-coloured earphones during their exams.
Ms Tan pleaded guilty to 27 charges. Three others deny charges of cheating.
The exams were the O-levels, typically taken by students aged about 16.
The plot was uncovered after an invigilator noticed unusual sounds coming from one of the students involved, prosecutors said.
The student was taken aside after his exam and asked to remove his vest. A mobile phone, Bluetooth device and skin-coloured ear piece were found on him.