Can I change my B2 tourist visa while in USA to a F1 student visa.

Provided that you did not have the intent to be a student at the time that you entered the US, you may be able to change status to F-1 student in the States provided you have the proper I-20 school acceptance form and adequate financial support. Kindly note that U.S.C.I.S. does not issue visas – it only issues changes of status. In the event that you must leave the country after you change status, you would have to visit the American consulate or embassy and apply for the F-1 visa to return unless you are a national of Canada.Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.  

Yes, you can change from B2 to F1 status (assuming you have a school lined up to admit you and process the I-20 for you).