What is the importance of EPEC ?

EPEC is not a complement for visa which will authorize you to stay Singapore. But, having EPEC will ease a lot of issues and catalyze the EP process into some extent. If you have it, then you can go through Singapore immigration with apparently no troubles, you MAY have a your own room (depends on the owner and the town council), you can apply for one year visa via EPEC then you can reduce the risk, you can make this EPEC holding as tool for the interviews, because all the nasty agents try to pressurise us if we are at the edge of expiration of visit visa.