Chinese preschools in Singapore teach Mandarin to children who may speak English at home. Some are immersion programmes, where Chinese is the language of part of the school day. Others are lessons inside an English-medium day. The way Chinese is taught matters as much as how much of it children hear, because Chinese is not learned in the same way as English.
How many characters should a child know before Primary 1? There is no official number. More important is your child's listening, speaking and attitude towards Chinese, then character recognition, then reading. The two Primary 1 textbooks together introduce 364 characters to recognise and 157 to write, and Primary 1 starts with pinyin. For the full order of learning, see Primary 1 Chinese Readiness: What Should a K2 Child Know?
Why Chinese Cannot Be Taught Like English
English is largely phonetic. Once a child knows the relationship between letters and sounds, they can decode a word they have never seen. Chinese is pictorial. Each character is its own visual pattern, and most carry meaning. There are no spelling rules that let a reader sound out an unfamiliar character. A child either recognises 想 or does not.
This is why a common approach, a list of characters each week drilled and tested, often falls short. It can produce children who recite the week’s characters in order but cannot recognise the same character in a new sentence or on a different page. The brain learns patterns more readily than isolated items.