I had mistake in my N_400application

You can write a letter explaining the mistake and also explain at the interview.

My I-751 is still pending. Can I apply for US citizenship?

You can apply now. I-751 is taking approximately 18-22 months. However, be mindful that filing for N-400 does not necessarily expedite your...

Naturalization get my citizenship?

Hire a lawyer first, make sure they review your history and then appear at the interview with you. A second interview is normal for pending cases...

is it better to travel foreign country with both college I-20 and advance parole for safety side.??

Yes, take both. You can enter with your AP and also show your I-20 if they ask for it.

Can I apply for i 130 for my wife if I already applied i 730 but it's been two years and no answer on that.

Yes, however, she needs to maintain her status under F-1 until the I-130 is approved and a visa is available for her.

Affidavit of Support

No. Divorce does not terminate obligation. See page 7 of the following form. Obligation is terminated when that person becomes a U.S. Citizen...

What is the length of time I must wait before calling my local USCIS office to check the status on my N-336?

The wait time depends on your local field office but typically these matters take from 6 months to a year.

Green card denied?

You and or your wife can apply for your minor daughter's green card now through yourselves. Contact an attorney directly for a proper consult.

How can I request a temporary stamp in my passport showing my "expired" green card is extended after I571 acceptance ?

You do not need a stamp until it's getting closer to the 18 months. If you go now, they will take the expired GC away.

If you call the the 800 number, they sometimes give you the correct one.