If my last offence is at 11/12/2020, when can I recover the 24 points back ?

Hi Sam, thank you for leaving a question. Demerit points will be erased if you're free from any traffic violations for 12 months since your last offence. You can enquire the status of driver improvement points through here: https://eservices.police.gov.sg/content/policehubhome/homepage/enquiry/status-of-driver-improvement-points.html