No. If you apply and you are granted a change of status from B-2 to F-1 you are not an overstay, You are still in status although in a new category.(F1 Student) Note that because it often takes CIS several weeks to process change of status applications, it is therefore important for you to file your change of status before your B-2 expires.
Answered on Jan 04th, 2013 at 3:30 AM