Besides having more resources, those schools are good because they get to cherry pick the gifted students ( bright non-alumni descents, lol) in primary 3. Not because their alumni kids are brighter than others.
If promoting social mobility is desired, why wait till secondary school. Why are non-alumni descents starting their game at handicap line. (lol this may not be appropriate, as I believe all schools in sg are equally good, just some are more equal than others :-))
Anw, we can talk till cows come home on this and nothing in reality is going to change. I m not going to reply u anymore. All my points are here.