My J1 status will be expired soon, I am thinking of changing status into F1 , but I have applied NIW a week ago, do i need to withdraw niw and get F1 first, or leave NIW there and apply eb 1 (a), I want to work in China for a year , but, idealy get green bafore leaving, the worst case will be: my immigration denied , and i could not apply for non-immigration any more in the future ( after I work in China ..) Pijiang Da Xia, how to avoid this situation, many many thanks