Supplements for a Physical Screening Test

I’m an 18 year old guy, 5feet 8inches and 150 pounds. I'm in pretty good shape and am currently training to earn a special warfare contract by scoring well on a Navy Physical Screening Test. The PST's structure looks like this: 500m Swim, 10 min rest, max pushups, 2 min rest, max sit-ups, 2 min rest, max pull ups, 10 min rest, 1.5 mile run. I am currently scoring well in everything but the run at the end. For a couple of weeks I’ve been running five miles a day to help, but I’m seeing no improvement in the run during the PST. I’m so exhausted from the rest of the PST that all my form and power to run is gone. Are there supplements I can take to give me the energy I need to make through the run? Any ideas?
 
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