OK?
The Army doesn't yet do all it's business by internet. The time will come, undoubtedly, but not yet.
Think logically. If the distance was 1 mile and you had to run it in 14 minutes, you wouldn't do it. You'd walk it. So the distance has to be 1.5 miles to make it worthwhile.
If you took 14 minutes to run 1.5 miles, you wouldn't be impressing many people. So you do your best effort and try to do it in 6 minutes.
If you could do it in 6 minutes, you'd be an olympic athlete. You're not, so you won't, but you can still TRY to do it in 6 minutes. That's the idea of best effort. (Really it means that you're running as an individual, doing your best, rather than trying to run at the same pace as the rest of the group).
Tomorrow morning (i.e. before 11:30, so get to bed when you've finished reading this), phone the people again and listen carefully to what they say. Make sure that you have paper and pencil to hand and write down what they say. When they've finished, read it back. I'm not taking the pi$$. They will give you all the information that you need, but you need to ensure that you have fully understood what they have said and not missed a vital bit of the conversation.
And relax. There's no need to go stressing yourself.