After Sept.11th,it's difficult to change B1 to F1,unless the applicant tells the immigration officer while he/she enter the country,and the officer will mark it on I-94,but almost Chinese don't dare to do so,because they'are afriad of rejection of into USA.
By the way, the period of remain is important,sometimes the immigration officer only give the B1 visa holder 2-3 weeks,if you submit the application for F1 in so short period,the INS will think that you lied while you applied the B1 visa,and will deny your I-539 application ( change to F1).Right now you should understand the thing will be depended many factors,good luck.
By the way, the period of remain is important,sometimes the immigration officer only give the B1 visa holder 2-3 weeks,if you submit the application for F1 in so short period,the INS will think that you lied while you applied the B1 visa,and will deny your I-539 application ( change to F1).Right now you should understand the thing will be depended many factors,good luck.