YMC Int'l kinder

I m cat2, a local chinese. My son started his K1 esf wks when he was 2.8 and now almost complete n going to promote to K2, so he is the youngest boy in the class. Aim at first priority: SJS / RC; follow by ICS / HLYIS for pri sch.

I can't say esf wks is good but seems like students there will hv priority getting esf pri interview;
I like YMCA ... after scan all yr comment here (thanks everyone) but worry if it is a silly move as I aim at ESF pri sch;
I know the chance of ICS n HLYIS pri sch is minimal if not join from kinder but then again not sure if it is a wise move;
Also, kinda worry if he don't know Chinese since all r English sch

1) So... Which kinder I should go for
2) Any recommendations to improve Chinese by self learning or supplementary play class?
3) in case, after all, no IS pri sch accept him, at the same time his chinese language is terrible, then what should I do?