does teacher to student ratio matter that much for CCs ? realise that most hdb cc max out the ratio which means each kid gets less attention :( will it affect their mental and emotional development?will they be less expressive as a result?

I don't think that it will really affect development. Children seriously do not need so much attention to be able to clachieve those development. Some free play is good enough and of caz some interactions w teacher and friends. The ratio is more of a "personalized" "dedicated" kind of attention idea which is a good to have but not necessary unless ur child has conditions that require a lot of attention. I don't think they will be less expressive as it's not always a teacher-child expressions. Classmates comes to play too. At home I am sure parents also interact w the child and on the wkends too yar