Can I apply for Green card (NIW EB-2 self petition) while I am still on OPT. Planning to apply for STEM extension.

You are free to apply for a NIW at any time - the trick is meeting the eligibility requirements (they are not easy to get).

You are free to apply for a NIW at any time - the trick is whether or not you qualify (they are not easy to get).

Non-Compete with the Employer

You need to speak with an employment law attorney to evaluate the enforceability of the agreement and your options.

Is it possible for a stateless person in the U.S. to invite immediate family members for a visit?

The fact that you are stateless has no bearing on your family members to come to the U.S., if they are eligible for some visa classification. If...

Immigration question

No you cannot. But your sister may be able to get a waiver of the joint filing requirements. She should schedule a consultation with an...

I140 & priority date carry forward

You will be able to keep your priority date, even if Company A withdraws the I-140, but you will not be able to use that approved I-140 as a basis...

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I-485 pending - change of Address

You must notify the USCIS of your change of address, by going to the USCIS website (under the "Tools" tab for changing your address on file) which...

Travel plans on STEM OPT and H1B Approval ? Risks ?

The answer depends on many factors that only the attorney that filed the petition would know - how was the petition filed (change of status or...

Regarding erroneous mail

Just because you are a foreign student does not make this an immigration issue.

Is it ok to file form N-400 while my green card is expired.

Please see prior response to your first post.