I want

I entried Arakawa 30k race held in January.
In the race there are many pace maker from 4:00/km to 6:00/km.
I entried in the group of 4:00/km pace maker. But my target pace is 4:15/km in the full marathon. I will(have to) do much training of pace run and will be able to run in the pace 4:00/km thorough 30km.
Today's training: 6km jog in the morning & 20km run(4:30~5:00/km)
monthly mileage for December 77km