In general, it is possible to change status from H-4 to F-1 provided that you have the appropriate (I-20) documentation from the school you intend to attend.Note that H-4 is a dual intent visa, but F-1 is not, as a result, you may be denied the change of status if USCIS concludes that you have immigrant intent.Note also that change of status only applies while you are in the United States. If you are not in the United States and have a currently valid H-4 visa, but wish to obtain an F-1 visa, you must simply apply for an (entirely new) F-1 visa. While you can reuse some of the documentary evidence you collected for the H-4 visa for the F-1 application, it will be a new application.