Can I get a new student visa?

You would need a waiver before you could acquire any status other than J visa.

What is the prevailing wage in Wayne County fro EB2 category green card in Automotive field

This would depend on the precise occupation, not merely the industry in which you might be offered employment.

The only option is probably seeking an "extreme hardship" waiver, which is an arduous process.

Any possible solution if a private high school doesn't issue I-20 for international students?

Not a visa solution, so your cousin would be in an unlawful status.

Can I use my AP if my H1B stamping is denied?

You could use the advance parole, as long as it is still valid.

Is Premium Service has been stopped temporally for H1B extension?

Yes, as of May 26, 2015. If your visa is expired, you should not travel while the petition is pending.

I131 please help!!!

Schedule an InfoPass with the USCIS to request that the travel document be expedited.

Biometric appointment I-90 is scheduled . Can i appear in Biometric appointment of I-131 by showing the I-797C receipt

Possible, but not probable. The best thing to do is bring all the receipts with you to the ASC and see if the USCIS will accommodate your request.

I wrote a letter to withdraw my I-485 and I-765.Can I cancel my withdrawal letter and how?

That is probably not going to work, but you may want to schedule an InfoPass with USCIS and see if you can intercept the withdrawal with a a...

Need advise

The first I-130 will be denied, whether you withdraw it or not. The more likely issue this case presents is why the 1-130 was pending for 3 years...