学生签证在学习结束后,通常再多给6个月,
这个6个月算Green Card,属于residence permit for jobseeking
If you find a new job while you are working, or while you hold a residence permit for jobseeking, you must apply for a new residence and work permit. However, you may begin your new job before you have received your new permit, provided that you submit your application no later than the day you start your new job