My wife recently got her H4 visa stamped (in November 2012) and arrived in the US in the 2nd half of December. She has got an admit to a local state university for her MS program which she would start on H4 visa status. However, we wanted to understand if there is a preferred time period that we should wait before filing for her COS from H4 visa to F1 visa. Does this have an impact on how quickly the application is processed and whether is is accepted or denied?
Any help would be highly appreciated!