What does "EOIR filing cancelled" mean?　How could such a thing happen?

You should speak with your attorney.

How long after biometrics?

The biometrics notice typically comes in faster than that. It usually takes about 4-6 months after the biometrics.

Ive got a misdemeanor charge (im not from the US), bc one of the guys in the car i was driving had marihuana, help.

You need to speak with a local immigration attorney as soon as possible. Convictions can have harsh immigration consequences.

Is it likely that my advance parole will be approved

You should consult with an attorney.

What are the consequences for leaving the U.S. while awaiting immigration through approved (I-360) petition?

I agree with my colleagues. You should speak with an attorney.

G-325 or G-325A and evidence of relationship

If you are truly struggling with G-325A, you should consider having an attorney handle this. G325A works in these cases. Depending on the country...

There is no such sponsor for an F-1 visa. Perhaps you are referring to an informal letter of support of some kind. If someone said you will be here...

I am a US Citizen. My mom is a resident. Can my mom ask to bring my grandma or do I have to do it?

Your mother will first need to become a citizen. Tourist visa is likely not going to work.

N400

If the police officer gave you a warning and did not file any charges, you should not have a problem. If you are unsure of the exact outcome or...

Does an RFE mean that USCIS is about to deny my case?

If you are seeking a true second opinion, make an appointment with a local attorney and have him or her review your petition and the RFE. Issuance...