3)what are the advantages of taking IB Diploma? In comparison to others.Your main alternative in Singapore would be to take the Singapore-GCE A-levels. In that case, you have no advantage from an US/UK admissions point-of-view. It is widely held that the S-GCE A-levels, along with the HKALE, are much harder than the UK equivalent and thus on par or even surpassing the IB programme. RJ and HC should have better reputations among the US/UK universities so you might get a *tiny* boost from there as well