Do i have to bring my work permit to an immigration marriage based intrrview?

If the AOS application will be approved the same day, the Officer will, in all likelihood, request that you surrender EAD/ AP document.

Reasonably safe to restamp by H1B visa in Canada? (first H1B stamping in home country, US masters degree, 5 years in the US).

1) Visa is required only to travel back to the U.S. 2) No, if new visa is denied, the old visa will likely be cancelled.

Seems to qualify under primary or secondary educational institute.

Green card holder applying for wife.

There is no minimum.

Can I file the I-539 together with I-765 on a L2 visa?

Follow the instructions on respective forms and ensure you add respective fees with each application. Do not send one check by adding the fees.

I140 pending for 10 months and no response to the SR's

The normal processing time for Nebraska Service Center is 4-5 months. Was a RFE issued? Was it timely responded to?

It is best to request your school to send you a copy. At most, USCIS may request it through an RFE and you can provide it.

I'm an on F1 and a company I worked for back home is applying for L1B for me. Are my chances better applying here or back home?

It is a call your company will make depending on what is advised to them.

Can another company file GC for me ?

You are running against time here if you intend to apply for residency. I don't believe you have time to look for answers on a forum. Consult...

Unable to update departure record

Are you making a new application to the USCIS or to U.S. Consulate for a visa?