Passing the exam does not guarantee a departure to South Korea, this is true. After taking the exam and luckily passed the exam, the worst thing to happen is that, the validity of your roster may expire! And you never got the chance to fly to korea. But that's a rare case, after passing the exam, the fastest time to get employed is 3 months, the longest time is 2 years! It always depends on WHEN you'll be selected by the employers in South Korea!!