Got only 1 year extension after 6th year (I-140 approved). Safe to switch job?

You can only get 1 year extensions based on approved I140 if you have been in H1B status for 6 years.

My Visa has expired, but my I-90 does not have a date on it indicating when I need to leave the country. Am I overstaying?

We need to know what visa you have and if oyu are still employed by the sponsor

What is the process for me to marry a mexican immigrant that i am engaged to. what are the documents necessary also

I would discuss the case with an experienced attorney who needs ot see all orders.

If my husband was in orison, do i have to put dat as an address on his G325a?

Yes if he resided in prison in the past 5 years

Different lawyers charge different prices depending on experienceand reputation

Do I need to file I601A or I212 waiver forms when doing AOS for diversity visa? I am currently on F1 status with a 212 waiver.

You need to consult with an experienced immigration attorney who needs ot review all pertinent documents

Can "installment sale income" proved in IRS FORM 6252 be used as income for I-485/I-864?

he can use this. Just provide documents ot evidence this income

Just got an open intoxicant ticket while underage. Will this affect my permanent residency status or citizenship?

Probably not. Just disclose it in your application

How long will it take to get the I-130 approved and get passport stamped?

Your case is complicated. Consult with an attorney

Should I continue checking the "us citizen" box on college applications?

You should not lie on applications. There are severe consequences for false claims ot citizenship Consult with an attorney