USCIS Form I-912. Do I qualify?

Visit www.uscis.gov for complete instructions in fee waiver requests.

Derivative child under F4.I am 25 years old now.and cspa age is 18 years.Am i covered under derivative?

If your CSPA age is under 21, you would continue to be a "Child."

Does an unsuccessful porting from EB3 to EB2 after embassy interview mean that the EB3 approved application becomes invalid too?

It appears the Consul has taken issue with the validity of the EB-2 petition, which may or may not have any bearing on the EB-3 petition.

If my ex has had 2 big problems with my son and step son involving DCFS does it make a difference in me getting residency?

This sounds like it may be a dependency question.

Has CSPA been abolished for F3 & F4 categories after the Supreme court opinion in the Scialabba (Mayorkas) vs Osorio case?

No, CSPA has not bee abolished. The Supreme Court, however, sided with the BIA's interpretation of Matter of Wang regarding Section 203(h)(3).

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Opt expires 60 days period file f2a

You need to present all necessary documentation and legal authority to support your case in response to the RFE.

Which previous address should I mention on AR-11 if I return from out of the country but I have a mailing address in Chicago?

Use the last permanent address in which you resided.

I applied fro OPT with course required credit ,but USCIS said that course is not complete and denied OPT . what is next ?

You must discuss this with the DSO of your school.

Do I need to bring the original Tax return to an interview for a sponcered immigrant or would a copy of this document suffice?

The NVC and Embassy may accept copies, but could request to see originals of certain documents.

What do I do if Immigration loses my original I-305 form

You should appear in-person at the ERO Office of the USCIS with all the paperwork.