Don't be nervous!! Even with 31 points, I still have to get through the interview. That's 10 points. I am terrible at interviews and that is the part that worries me. You should be fine with what you have, there are still more points out there to get!
I was thinking of going PRN, but I need the full time hours. I may have to make some tough choices, it is only for 16 months after all.