you'll need to define and decide your definition of good childcare center. style of teaching? food served? caring teachers? and also your budget. promixity to me is very important too cos I don't like the hassle of too much time travelling to and from school. its important to go down and take a look, ask questions and see the school to feel the vibes. for really popular schools, you may want to register as soon as you've decided cos the waiting list for a lot of preschools, especially in sengkang punggol area can be super long (think 300 over in the queue). I put my girl on wait list for pre nursery when she was 2 months old and only got a place when she turned 21 months. this article may be useful for you: https://sg.theasianparent.com/how-to-choose-the-right-day-care-centre