Your field of study would fit most any job. Just clear it with your DSO.

Who decides what jobs fulfill my OPT requirements?

USCIS AND ICE are the ultimate deciders. Follow the recommendations of your DSO as the employment is supposed to be related to your degree.

Does anyone knows how long it takes to hear from the consulate after sending the requested documents?

As my colleagues have noted it depends on the consulateand the information needed to complete the process. Normally one to two months, but maybe...

If a case is accepted for expediting, how long would that take for approval of request then case from USCIS

There is no specific time frame unlike premium processing. Depends on what CIS is required to review.

Can I acquire permanent residency in the US based on previous multiple H2A visas?

There is no basis to obtain resident status from having multiple H2A trips to US.

I-94 end of stay while waiting on B2 to H4 using I-539

If timely filed, she may remain until a decision is reached or the max eligibility date in the filing has passed.

I am asylum pending applicant. I want to get married.If I add my wife to my asylum case, would she be eligible to apply for EAD?

Your wife may be eligible for an EAD. Speak with your immigration attorney.

What type of form can a sponsor fill and what are the documentation to summit with the form

Petitioner must be a sponsor. A co sponsor is permitted when petioner income is no adequate. An I 864 is required.

What is the possibility of obtaining a SSN card with a EAD card that has an error (misspelled last name)?

Try applying at Social Security if not accepted what for corrected card.

What should I do now ? My lawyer told me to wait .. Should I worry ?

Security checks are required some take longer than others.