How do I go about getting my niece from Mexico?

Her mother has legal custody until and unless the Mexican officials change that. She is welcome to apply for a copy of her birth certificate and...

Second preference is current for Bangladesh, meaning, no wait for the visa. You cannot get an F1 for an online program.

Who should apply I 130 for my DEPORTED sister? Me ( working US citizen)or mother (not working LPR)?

If she is married, only you can file. If not both of you should file. Mother is faster.

Now get my citizenship through marriage want to file for my mom been a stay home mom and student. But my husband file for me

Yes, your husband can be a joint sponsor for the affidavit of support.

What document should be enclosed with the deffered action application

He probably sent the diploma.

Can i apply a fresh l1b if i already have a valid l1b with 5 month left of my stay for 5 year completion

No, 5 years is the limit.

My one year outside USA after 7th yr of H1B completes on mid Sep 2013.. Have jobs openings ready to hire me on a new H1B visa.

There are no more H1b visas for this year, the soonest you can come is October 2014.

Do american citizen who stayed over 6 months in the uk are rquiered to go through amedical test before the are returning to the

The U.S. does not have any control over the laws of the U.K. However if she believes she is being unlawfully detained in the U.K., she should...

Do I need to file form I-102 to obtain an I-45 in order to continue my I-485 application?

They have stopped issuing paper I-94's, so you can get your number online and alternatively your passport stamp shows your entry.

Green card question

It is not relevant to your application, however USCIS may uncover it in reviewing your situation and could ask you about it.