Whoohoo! Congrats to you. Plenty of solid advice above.
RE the paperwork packet. Make a copy of it in its entirety. Our DS also put a scanned version on a thumb drive. It will include a background clearance questionnaire that is about 267 pages long (kidding, just feels like it). You will have to fill this out over and over during the course of your career. Having a copy of your original, with dates, addresses, jobs held, places lived, schools attended will make it easier moving forward.
Ditto to birth certificate. Start the process now of acquiring a certified duplicate. Mom can keep one (she earned it) and you can take the other with you once WP is done with it.
Keep your nose clean, grades up, bubble wrap not too bad an idea.
@HCopter isn't wrong. Let mom and dad spend as much time (and siblings) with you as possible. You will wish you had more of that soon.
Sort your room and closet. Make arrangements to have a person you trust local at your bank if you need in person assists while gone.
RUN, and then do that some more. With good shoes and insoles.
Remember your why, why you went down this tough road. It is hard and it will likely get more difficult. But if you remember your why in those moments it will be easier to get through those. Consider writing yourself the 'why' letter and leaving it with someone. When you need it, ask that it be mailed.
Congrats again, enjoy your time until the big day!