Do you want your child to study in international stream? I am not sure if Zenith has international stream for K1. At least the one at YL does not have. Also where do you live? If you live in Tin Shui Wai, have you checked how long it take from your home to St Lorraine in YL?
In fact I do not know a lot about Zenith especially the one in Tin Shui Wai, but my kids are studying at St Lorraine in Palm Spring. I like the school very much.