Hi Poison
In fact, kindergartens are not categorised as 'local' or 'international'. They are categorised as 'private' or 'non-profit'.
If the fees in the private ones are prohibitive, you must ensure you apply for the pre-primary voucher for your son for K1.
In TKO, there are lots of non-profit kindergartens. Many will have the main language as Cantonese with a little English and Mandarin every or most days. See the full list here:
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No short cut, I'm afraid. Call the ones you like the look of and ask if you can visit.
All the best!