Questions to RC parents!! THKS!

Hi, all RC parent, may I know which kinder your kids studied and if I want my kid study in RC, it's also related which kinder he studied? they accept only kids who studied in int's kinder or both int's and local kinder? and the interview is difficult? do they hv any cat. like holding foreigner pspt hv higher chance to get in? mixed kids easier to get in as well?? or they just see the performance of the kids during interivew?
In fact, my boy now is studying PN in greenfield(int's class), but I 'm not sure to send him to REAL international kinder for entering RC or CWB?? I like greenfield, to me, they hv structure for teaching and kids can do whatever they want, they must follow the rules, and they do teach hand writing and later on, there is phonic teaching as well..
If I need to real int' kinder, I must choose abacus(for entering either RC or CWB), but I 'm really worry they 're too freedom... so anyone can tell me what I can do or wu u mind sharing your thought and experience here?
Millions THks!!!