Without signature it may be returned but if accepted the filing fee will be kept.

I also want to ask if I didn't print my name and A-number on the back of the photo,uscis will reject my n-400 form?

The application should be processed. If the photos get mixed up they may require new photograph's. the filing fee will be kept.

Uscis cash my money if I did any mistake on my n -400 form or give my money back ?

No - once accepted the filing fee is not refunded

What to do when you can't attend your adjustment of status interview?

Yes contact the office where you are having the interview. Consider doing so in writing and through an infopass appointment. keep records.

How can I come immigrate with my wife in the US ?

You mother files for you and your spouse and children under the age of 21 may migrate with you as derivatives. if you plan to visit your mother in...

Since it is not a name change consider a letter or affidavit from Indian government official or expert offering explanation

There has been no change, he will be permitted to travel as before

Can I Travel to Puerto Rico with administratively closed case ?

While permitted consider taking a Mississippi river cruise and avoid any possibility of being considered having departed the US

Is it possible to get F1 from J2?

Not a recommended strategy unless you are prepared not to receive a visa to return to the US

L! to GC?

Possible but very unlikely to occur during first year