I came to the US in 2011 to pursue a Masters, graduated in May 2013 and have been working since. I got my H1B in November 2014, which expires in November 2020(3+3 years). I wish to go back to MBA school in August 2019. How will switching back to F1 affect my H1B chances and will my future employer have to file for my H1B even before I start working with them? How will this process work?