Have I filed my application in a timely manner?

If you timely filed for an extension, you may remain while the extension is pending even if your I-94 card has expired.

Rescheduling my Immigrant Visa (Green Card) interview at a US Consulate for the second time?

Yes, i would reschedule and advise you are waiting for adjudication of the J-1 waiver which is taking longer than expected.

What is the correct process to follow if I over stay my visa for years, and want to marry a us citizen?

Since you have a legal entry you may file a one-stop packet to get your permanent residency after marriage. You can start the process any time but...

H1 transfer denied while the initial H1 was terminated after resignation?

Fastest and safest is to get a new I-20 from the school, pay SEVIS fee and book an appointment at your home consulate.

You may remain so long as the H-4 change of status is pending.

How to apply for a temporary emergency visa?

Obtain a passport and visitor visa with documentation of her sister's medical condition. she will need to show strong ties to Mexico to obtain...

Why did my case status chnge from "we ordered your card to being produced" to validation error?

no way to know --- likely a computer glitch. Wait a week or so and then call Customer Service if no card arrives and nothing changes.

How can i get a work permit?

You can't get a work permit on a tourist visa but you can consult with an immigration attorney on whether you might qualify for another...

What should I do to maximize my chances to keep my green card during my separation with my husband?

The options you read are correct. You can file jointly or you can file separately requesting a waiver of his signature. If you do the latter then...

Do I need to file a separate I-130a application for my step-son? and if yes how much is the fee?

If you are a U.S. citizen you need a separate petition for each of them. If you are a permanent resident, then the child can be included.