Hi Cheong Eng Hoe, thank you for your question. LTA will send a notification about three months in advance if your vehicle is due for inspection. Simply drive your vehicle down to the centre of your choice to get it inspected. You won't need to bring the inspection letter, as the centres will have your vehicle details at hand. For further details, check out our article here: https://www.motorist.sg/article/499/everything-you-need-to-know-about-vehicle-inspection-in-singapore