My son just went through this last year, and honestly the biggest thing is to start with professional lessons first before you do any practice driving with them yourself. In Singapore, they need to pass the theory test at the traffic police before the practical, so make sure they study the handbook properly because the questions can be quite specific about our road rules. Once they're on the road with you, stay calm and patient because teenagers can get flustered easily, especially when dealing with our heavy traffic and tight parking spaces. I'd also say give them lots of supervised practice on quieter roads before tackling places like the expressway or busy town areas, and honestly, don't assume they'll pick things up naturally because every kid learns at their own pace. What's your child's timeline looking like?