They are looking for candidates to train as instructors.
Most likely you are Singaporean and are not yet old enough to be a cadet pilot for SQ, MI or SinCargo.
This is the usual back door strategy for people with passion but are caught out by the age requirements. If you are just using them as a means to waste time before you qualify, they will smell it. When you are done training, you start at less than $2000 as an instructor, so you really gotta have passion teaching passionless (mostly) young men in a sweaty C152.
Quite a handful have come this way since SFC started operations in the late 80s and they are now captains with various airlines. Strangely none are with SIA still (IIRC). One is with Silkair.