When do I need to get my visa stamped.

This is a loaded question. Currently I am on OPT, I will be going back to school in the fall for my masters. Is it mandatory to leave the US. To get a new student visa? Do I need to get a new student visa in order to be in school since I would still technically be student status? If I do not get the new visa will I be able to travel? If I have to go home to get a new visa how long will it take for me to get te new visa.

If your OPT lasts until your new F1 program starts and your SEVIS is transferred to the new school you can probably remain in the US. Talk to your school’s international office.