I think boy/girl is currently even. The racial mix I could not really comment on, throughout the school no single race appears to be under or over represented. But also just because the malaysian looking child has a malaysian looking mother doesn't mean dad isn't white and mum isn't australian. Or that the indian child isn't actually brazilian or turkish. A lot of the children have parents of different races or nationalities. If you like I can check but I must admit it's not something I've thought about before. It's not an issue, no particular culture is dominant or ignored. The teaching materials also reflect that. We're white British and my 5 year old has never lived overseas until now and it's just been fine.
I would use the bus , the children are escorted to and off it and it's all very safe and well organised with a lady chaperone on each bus (who the children all greet very happily) but living very close does not mean less time on the bus, we are a 10 minute drive from the school and our pick up would 6.45 am. It's down to routes, so i drive them myself. Your best bet is a
condo nearby. If you go past the school there are a number of them, all different budgets. Given a different lifestyle I would be going for Pine Wood ( I think that's what it's called) that is right next door to the school or Ridgewood, just over the road. That one has really nice facilities, shops, dr etc. I believe you can walk to Dover MRT from there and the bus to Holland Village is frequent and it's only 5 minutes. I know nothing about pre-schools at that end although I have heard good things via friends of friends about White Lodge. There's a montessori just up to the left of Ulu Pandan. Near Sunset? From what I can gather a lot of the younger children spend the day with helpers if both parents work and they do all seem very happy with that.