My 6 years on H1b in US are over. I have a approved I-140 and based on that I have a H1b extension for another ~2.5 years. I plan to go to school in the US for an MBA degree and will need to move to F1 Visa for the next 2 years. Can I legally work in US after my education is complete? Or do I need to move out of US before starting employment on either H1B or OPT (If these are allowed for MBA students)?