to work on Speed do Fartlek training
Q+A: How do I do fartlek? - General - Runner's World
For endurance, you need to add the miles, Push your self to do 2 miles,
Really the training for such a short run is going to be more about Speed work, as you get your speed work going you will find your endurance for those last 2 laps will already be there.
Problem is you only really have 10-12 days to get yourself up, you should also look at your diet, on the day of the event for that extra energy at the end of the race