don't worry about chances. make sure you give them everything they ask for. The nice thing about an RFE is that it isn't a denial. It's a second chance to make things right. If you need to get advice because your future life depends on approval you shouldn't try to get it here. Good luck!!!!
You should consult with an immigration attorney, as your status is on the line.
Please note that this posting does not constitute legal advice or create any attorney-client relationship with the inquirer. Avvo is a useful forum to obtain general information on legal issues, but is not a substitute for direct, confidential consultation with an attorney in any legal matter.
The USCIS may be concerned as to whether there is a gap between your requested date to start the EAD and your graduation. There may be a good explanation combined with poor training by the USCIS. You can pull your transcript, but if you were less than full time for the last semester before graduation, then you may need a competent and experienced immigration to work with you to carefully explain whether or how you qualify in spite of USCIS confusion. Good luck.
This is general information, not legal advice, and does not create an attorney client relationship.