What to expect for RASP, how do i prepare in short amount of time?

So i’m in AIT, actually just graduated..but anyways, i’m a holdover for what i thought was airborne. this whole time all 13 weeks it’s been airborne! it’s even IN MY CONTRACT. But earlier this morning my DS tells me “hey you’re going to RASP” I didn’t believe him one bit till i asked for proof. so now, i guess i’ll be doing jumpschool AND RASP in the short weeks to come. i still can’t believe it considering i never volunteered for it, never mentioned it..i did want to do it some day however i wanted time to prepare and train before. But as my luck would have it ..my orders are being arranged to include RANGER. AGAIN i have no idea how it happened but it did and i see this as an opportunity to run with it and become part of the 75th. all i ask is what can i do in a short amount of time to hopefully prepare for this brutal task ahead of me.