Currently on H1B, i have not worked with my previous employer for more than 5 years, if accidentally they generated a w2 2015

I agree with my colleagues. Contact the company's payroll department to correct the error.

How long Change of Status takes to change from B2 to L2?

I agree with my colleagues. Generally, 2 to 5 months. Contact the company's US immigration attorney for assistance.

I agree with my colleagues. Contact a US immigration attorney for review and assistance.

What information is needed from me?

The company should contact a US immigration attorney for assistance in determining status eligibility and filing the appropriate petition.

Are both the above concerns valid and true ? And if yes, do we still have any option to get married with impacting her travel ?

I agree with my colleagues. Contact a US immigration attorney regarding your eligibility for naturalization and other options.

What kind of visa can we have students from India come to the US for a 4 week vacation cum mentorship program?

I agree with my colleague. Contact the j1 sponsor program and/or US immigration attorney for assistance.

I agree with my colleagues. Contact a US immigration attorney to review options.

I agree with my colleagues. Contact a US immigration attorney regarding potential waiver issues. Contact a tax attorney to file corrections.

Will my child have US citizenship if born to a foreign national mother and a US citizen father?

I agree with my colleague. Contact a US immigration attorney to review the specific time-lines to determine eligibility for citizenship or green...

Do i need to ask Employer to file an amendment to submit the correct Education Evaluation and is it a material change ?

I agree with my colleagues. Contact the company's US immigration attorney for review.