Me and my husband moved to Singapore last year, we both are English. I have a 4 year old kid, he has Mandarin as language subject in school. Now I know Mandarin is one of the most spoken languages in Singapore, but is it necessary for him to learn Mandarin? I mean is it really worth it?

It is always good for kids to learn more new languages. For young kids they learn very fast in the environment. In Singapore, learning chinese in School is based on immersion and I am sure your kid will pick up very fast. In addition, your kid will be able to communicate to people in Singapore in Mandarin since most of the residents here are Chinese Speaking.