Can I petition my stepson?

If married with parent before he turned 18.

Do I have to wait 10-12 years for my green card if I am already living in the USA when my I-130 petition is approved?

If you are here illegally for long periods of time, you will need a waiver, possibly. So contact a lawyer to discuss that.

How can I know about my interview information and date ,does they send me an email or I should check by my self ?

They will send you or your lawyer a notice of action letter.

Selected as the best answer

Can my step dad sponsor me for a green card?

Only if the marriage to your mother or father for that matter was before you turned 18.

I have lost my OPT ead card?

Contact your company's attorney, for an update on your case.

What options do I have?

Very complicated matter that requires a paid consultation.

When can I change job internally with same employer after EB2 India I-140 approval? Only 10 months left on the 6th year of H1B?

Very complicated matter that requires a paid consultation.

Student Visa?

That was not a very smart way to get a visa.

(LPR)Filing petition for alien relative over 21 in a state where the petitioner don’t reside is ok or not?

it is ok. It does not matter where the parties live unless in case of marriage.

Do I have to do the medical examination again when applying for Naturalization?

USCIS already has your medical examination from before.