10km in 55mins 23sec

I finally managed to break the 1 hour mark for 10km with my new running technique finishing in 55mins 23secs. I did this on Sunday. So I now need to train for the 21km. But, I hope to be able to finish it first before I focus on improving my time. I have 2 months to prepare for it; and I'm really looking forward to it after the 10km run.