It is possible to change visa status while remaining in the U.S. First, you must obtain the Form I-20 or Form DS-2019 from your program sponsor (the IO). After receiving the I-20/DS-2019 and paying the SEVIS fee, you must submit an application for the Change of Status (COS) to the United States Citizenship and Immigration Service (USCIS). This process can take between four and six months to approve.
Refer to the Appendix C: Change of Status Instructions located within the I-20/DS-2019 Request Form for more detailed information and instructions.
For additional information regarding a Change of Status to F-1, please review the Change of Status Guide. The COS Guide provides information regarding change from any of the following classifications to F-1: B-1/2, F-2, H-1B, H-4, J-1.