indeed, I am going through the process of visa status changing right now. I submitted mine on May 14th. and got the receipt on May 24. Michigan, belonging to Nebraska service center. Vermont is one of the fastest ones in processing chaning from f2 to f1 recently. I will start mba this August. and also I am sure the CJ at mexico is still applicatable for f2 to f1. I made appointment too on August 10 in case I can't get the visa done in the U.S. I will take the chance and try to get the f1 visa there at CJ.