There are more than more web site that offer tutor matching service. But will singaporean get use to the idea of hiring tutor thru online service??
Of all the website that I know, one of the better site are
http://www.TutorAtWork.comThey offer a search tutor function which allow you to search for the tutor. And after you shortlist the student, they also have a biding system for tutor to submit their bids and for you to choose the best price and the best tutor among them.