My girl didn't go to N class. I needn't work so I think I can teach her most things. However, I take her to playgroup so she can still have some "lessons" + social life with other children.
In my opinion, it is a bit cruel for children going to school so early. They need to go to school for many many years afterwards so I prefer to allow my girl to enjoy her childhood as much as possible.
Even kindergarten is fun, I think children would still have some pressure in some degree.
but, for joining a good school, my girl might start N class for about half a year before K1.
It's true that if you what to enter a better kinder, you'd better let your boy go to nursery for training.
for my case, my boy is the only child in family, he always show shy to get close to the others. after attending the N1, i found he is more friendly, knows how to share, play with others.
besides, i found my boy not only knows cantonese and eng, but also a bit of mandarin.
and for those full time mummy like me, i do think everybody need inspiration. after taking few hours break, you may find your tolerance towards your child is becoming better.
these're what i felt after my boy started his school life.