http://www.icpas.org.sg/general/entry%20routes.asp
One thing you need to consider: please make sure the accounting degree your chasing will be accredited to take the ICPAS Professional Examination in Singapore.
NTU/SMU/NUS students do not have to take this examination as they are directly qualified for the associate course for CPA singapore.
At the end of the day, you don't want to waste years of your life chasing something you can't work as in Singapore (unless you want to work overseas).