1. time is important, we prefer wholeday schools as both of us (parents) are working.
2. hygiene of the school
3. whether other children enjoying going to school (need to go the school to observe)
4. of course, not super expensive tuition
p.s. kg is pre-school education only, not regular schooling. so, we do not prefer too "technical" (like very good training in foreign languages etc). proper training in behaviour, moral training and reading habit is good enough. this is what the young children need. i notice even some students in famous schools do not know these. what a pity!