Try check out Tadika Didik Sayang for your std 1, and real kids for your 5 y.o.
P/s: i have no experience with tadika didik sayang, but noted they have day care service for lick hung student, managed by former teacher from lick hung.
real kids have chinese medium and english medium class, starting from 4 y.o, in 2 separated class. Other kindie, as far as i know, are only few chinese classes per wk. But pro & cons, about real kids, for u to find out.