Yes, Nan Hua will be tough if you stay outside 2km . My cousin was lucky, his kid got into Nan Hua without doing any volunteer work last year (dragon year) as he stays within 1km, balloted and his kid got in.
Ai Tong will not be easy to get in as I stayed outside 1km, thus I've joined as Hokkein clan member, to get into phase 2B (still not guaranteed though), and I've also volunteered in Kuo Chuan Presbyterian. Very kiasu hor...trying to get myself for phase 2B for both schools first, see how's the situation this year, then decide. I've heard not so good things about Ai Tong so I'm really very undecided at the moment.
Janet,
If outside 2km, a bit difficult to get into NanHua unless you could register under 2B, but wait and see this years P1 registration, as birthrate is on the decline, so horse year babies definitely lesser, may still have chance next year. Come to volunteer work, (not to offend anyone) actually, all these "prestige" schools are selective; I got a feeling they only want the "right" kids (i.e. with professional parents)into their school, to make sure that the kids could help to maintain the school standard. Its not just the genes issue, most of these parents can easily afford to send their kids to the most expensive enrichment classes and will definitely not allow their kids to fall behind.
I read somewhere, a doctor has volunteer in a school and end up doing gardening work...so are they really matching your areas of expertise to their requirements??