Hopefully all students, including Singapore students and all students reading this, will first seek help (in any and all forms, including sharing your problems online as well as with real-life friends) if you/they experience severe emotionally distressing problems before doing anything desperate or suicidal.
[India] - Uni student passed exam but died after setting herself on fire for getting 0 marks, which turns out was due to a marking error.
http://news.asiaone.com/news/education/student-passed-exam-killed-herself-after-getting-zero-marks-error