When I was a permanent resident, I filed I-130 for my unmarried son who is 25 years old. The I-130 is still pending and not yet approved. Now I have become a US citizen. I understand that "Under Section 6 of the CSPA, the applicant can request exemption from the automatic conversion of the visa category from F2B to F1 by submitting to the Department of Homeland Security/U.S. Citizenship and Immigration Services (DHS/USCIS) a written statement that he elects to have such conversion revoked." Can you please advise me when I should file exemption? Is ir right away? Or after approval of I-130?. Thankful if you can please advise.