Hi Chinniah! You can check it through this website: https://eservices.police.gov.sg/content/policehubhome/homepage/enquiry/status-of-driver-improvement-points.html

Here's an article that details the offences that may net you demerit points: https://www.motorist.sg/article/534/traffic-offences-in-singapore-demerit-points-composition-fines