OCBC takes graduates every year through the graduate talent programme (GTP). These are ppl who pass many interview stages and considered cream of crop type.

So when they have to hire ppl one year from now, they will much prefer cream of crop fresh grads from next years graduating batch instead of converting the 3000 trainees that they took in thanks to heavy gahmen funding for 1 year only.

Bottom line is: Once no more gahmen funding they will let u go.