Despite your best performance in the earlier portions of the race, it may be worth working on increasing your strength and speed in the final phase of the race through special exercises and acceleration training, as well as paying attention to your running form and proper breathing for optimal preparation for the final sprint.
Learn to use your arms properly. Hill repeats are the best place to start, preferably under the helpful eye of a good sprint coach.
I agree. Do some tricep exercises. My highschool coach (one of the best in the nation) always has everyone do a bunch of dips
Pullups and or lat pulldowns and lateral rows too...a strong back pays dividends down the final straight. That is why a tank like Nick Symmonds can kick well.