basially, you have to do it yourself.you can go to ICA and cancel your student pass, and meantime, you will get the temp EP to provide your leagally stay in Singaproe
svp if no job
social visit pass,
but of course, the best way would be to find a job soonest.
1) Tell NUS that you do not want to convert to part time any more. If lucky, you may still keep full time status. (It should be done ASAP). After that, what why11 said is absolutely correct!
you can contact Registry Office ASAP to ask suggestion from them, and
go to your department and school to convert back to full-time student, if possible. good luck. I think they will know how to help you. Because i have the same experience with you, and understand the pain. Good luck to you, and hope you can find a job as fast as possible