Schools in MEL.
You will find that CAAS recognise training done at Massey University NZ, Oxford Air Training School UK and GFS at Moorabbin Melbourne. The best person to speak to about the above is Fauzia at the CAAS.
Or look at the Far East Forum on PPrune and ask the same question. It will be answered by Singaporeans. At any rate speak to Fauzia from CAAS who will give you accurate info as to who the Singapore authorities recognise.