Infy

Hi all! I am new here. I have a similar question. I have a 2 month course ( permitted on B visa, which I have already obtained ) to attend before I start my masters course( at a reputed university) on F1 almost immediately. I would like to know if I could enter the US on B visa and finish my course while I apply for F1 in US and may be visit CA/Mexico to re enter US on F visa. Can I interview for F visa while in US? Thank you for your help! I appreciate it!!