I gave my two week notice. My last work day is 03/04/11. I plan on leaving the country before March 11th. I will receive my final paycheck on March 31st. My H1B was renewed for the second 3-year term in November 2010. New I-797 expiration date is July 2013. I-94 expiration date on passport is September 2010.

To be in status, should I file a change of status to B-2 for such a short period ?

If I come back to the US for an MBA in August 2012, would I be eligible for CPT (summer internship) ? I used 12 months of my OPT for my first Masters degree in Electrical Engineering.

If I get a job offer before graduation, I've read that a H1B can be filed as COS from F-1. When can I start working ?

What is the grace period for staying in the country if I do not get a job post-MBA ?