It takes quite a bit for someone to get kicked out of OCS. Rolling is one thing, but being asked to leave is another. I wasn't in the best shape when I got there...probably did close to the minimum for the In-PRT, but the DI was really good at getting me to lose 25 pounds in about 5 weeks; so it gets "easier" the longer you're in. As long as you push and give it your all and don't give them reason to hold you back, then you'll be fine. Just try your hardest to stay out of H-class...people get in there and it seems like forever until they get out (some just get to comfy there). They did change the program quite a bit since I graduated (last November), but a good friend of mine just graduated not too long ago and said it's still no picnic even though there's less formation runs.