It depends on the timeline of when each H-1B Petition was filed and whether the multiple H-1B Petitions are for concurrent employment.

Yes, but your friend might want to consider hiring an immigration attorney for further assistance.

Once you travel out of the United States, you will need a new F-1 Visa Stamp. However, your Visa Application could be subject to scrutiny because...

Economic hardship EAD is available to international students. Please talk with your school personnel for further assistance.

Your H-1B Employer does not need to amend your H-1B Petition unless terms for your employment are to materially change. Increase in salary is not...

You probably need to wait until the status changes again.

Yes, a household member may be a co-sponsor with Form I-864. Please make sure to explain to the co-sponsor the meaning of signing the Form, though.

Your Employer may seek to file an H-1B Petition for you, and you may also seek EAD by filing I-485 through I-130 Petition filed by your spouse. If...

It depends on USCIS' determination on the multiple registrations by your current Employer.

Your question needs more information for a better answer. However, as your question may need to show confidential and personal information,...