 For those who entered the United States using a B visa, having an annotation on the visa saying that the entrant is a "Prospective Student" is generally a prerequisite for the Form I-539 application to be accepted.In general, the USCIS does not approve transition to student status with a start date more than 30 days prior to the program start date.Therefore, applications where the applicant's current status expires more than 30 days before the start date of their program are likely to be rejected.