Breeding place for racists as there is minimal mingling with other races. When enter universities also keeping the same company until in classes can see very clearly the division.

Does maintaining a race identity also includes excluding interaction with other races?

I support one aliran where every children are forced to interact with one another. Languages like Mandarin, Tamil and Arabic are given as options to be learned there. So there is absolutely no problem with loss of ability to speak in the said language.

can anyone pass any research or statistics that prove vernacular teaching is better that national system?

for research purposes.