Does my mom have to be physically in the US when petitioning me for a Green Card ?

Your mom must be "domiciled" in the US - that usually means presence, but not necessarily.

Jamaican visa

This forum is for US immigration queries.

I am on F2 visa and currently applied for change of status to F1.. what if it is denied????

Not all convictions would make you inadmissible. On its face, this should not cause problems but it is best to speak with your attorney about this.

Tax summons to legal alien recently returning to the country on a non-immigrant visa. Do I owe taxes?

As my colleagues have stated, you need to speak to a tax professional whether that is an accountant or tax attorney.

My USC wife and me living abroad after marriage and i didnt file cr1 application, since 14 months passed of marriage.

You can start the process now and with the current timing of things, you would still get un-conditional green card.

My USC citizen wife is living with me after marriage outside USA. She has no job and never filed tax return as she was studying

With the use of a co-sponsor. The co-sponsor need not be related but is required to be a citizen or permanent resident.

Hi My spouse i94 got expire in March'13 but she has valid i797 H4 Approval notice until oct'13,what is my spouse status

Assuming the I-94 is for her H-4 status, irrespective of the approval notice, the I-94 governs.

H4 and L1 queries

I agree, you would be better served making this inquiry to your company's attorney handling the L-1

You should speak with a UK attorney - this is a US immigration forum.

Can I get real estate license being on f1 status?

Getting your license is one thing, working in the field is another.