Thanks @ no-more-crush.My condition is exactly as told by chappaljutta. During winter , Due to weather I will not get  4o hrs.But after that there will be over time so the my annual income will be more than mentioned in LCA and also they are paying little high wage than the LCA. My concern is, during winter, I will be working below 40 hrs. And i am not planning to stamping within the next year. So I will be safe?