A Singaporean tutor has admitted to helping six Chinese students cheat in their 2016 exams in what prosecutors say was an elaborate plot. The tutor 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 earphones during their exams. The plot was uncovered after an invigilator noticed unusual sounds coming from one of the students involved, prosecutors said.