Simply get to to Woodlands CIQ, clear both immigrations, and after you leave Malaysian customs, filter left at the Shell station so that you can take the right turn at the coming junction. Head for Holiday Plaza, ie, drive along, passing BHP petrol station, Crystal Crown Hotel on your left. Take the left turn right after the Crystal Crown. Take the following second or third left turn before you reach Holiday Plaza. The mall is such a prominent landmark, you cannot miss it after the you pass the Crystal Crown.