Can i send I-864 with the i-130

Yes

Up to 90 days.

U-visa application

Yes you can and like my colleagues said, you will need that certification so make sure you are able to get it before you do anything else.

Is withdrawal of existing i485 required

I agree with my colleagues. Don't help USCIS come up with an excuse to make a mess of things. Just send in a fax, email and mail a letter...

I want to get a divorce, i have 2 minor kids one is with me here in the US other is in the Philippines. Is this possible?

Yes very possible but you will need a family law attorney and immigration attorney and make sure they are both on the same page.

Can u be turned away from a job bc they "heard" u have a drug problem??

This does not belong in the immigration section. This is an employment law issue.

Consult with the international office at your school. It seems like they steered you in the wrong direction when they told you to file the OPT and...

Selected as the best answer

My wife is studying MS on H4 and now I applied for H4 to F1 for my wife, change of status. Can she travel to India?

If you leave the US while the change if status is pending USCIS will consider it an abandonment of the change of status application. So best advice...

Will role change from Computer Systems Engineer to Computer Programmer jeapardize H1 Extension

You need to consult with an experienced attorney in your area. Your employer should discuss with the attorney the used to file your petition.

F1 visa after marriage .when I will be eligible to work in the US ? when I can be able to quit school ?

I agree with my colleagues.