Where is the best place to learn piano around Sengkang for a 4 year old

I recommend that you just use a piano teacher agency to find a teacher near your place or can travel to Sengkang easily... They only charge teachers money anyway, students pay the same whether or not you go through an agency. Just make sure to communicate your child's learning requirements and preferences to the agency beforehand. Here are some examples I found on Google: https://www.pianolesson.com.sg/ https://www.sglearnpiano.com/