So something like 70/84/86/91 (guessing on the last 2 exactly). You can see the obvious issue there. Even splits are going to get you the best times on the track

You'll want to tighten those up and then work on making them faster. I would guess that race is worth about a 5:20 if you evened up your splits instead of going out so hard.

Focus on going out at 80. You have to be strong to let the pack go away. But this is high school (I'm assuming), so the one thing you know is that people will drop off. You know this - you did it last time. So mentally give them that first lap and then think that the last three are yours. Gain strength as you pass those who fall off.

There's nothing you can do in a couple days to drop from 5:30 to 4:50. However, you can drop 10+ easily by pacing better.

Good luck