Ok so i just did a run, got positive results, and negative ones. i need your advice!?

Ok everyone knows im running 1.5 miles in 13:58 timeframe for a sheriff position here in TX. This job is what i want. I still suffer from shin pain but i can run through them now. I just came back from the testing site and ran a full mile, non stop in 8:40 sec. Im very happy about this because i didn't stop even tho i wanted to at the end lol. However, i notice that i stopped right after that and started walking to catch my breath. Then I ran a little again and stopped again, then a little more and stopped again. The last.20 miles, i had about 20 seconds to go and i couldnt make it so i basically walked it. Finished in 15:30 again lol. I know if i hadn't stopped after the mile line i wouldve made it. any advice, tips? words of encouragement?
Ok so i just did a run, got positive results, and negative ones. i need your advice!?
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