Someone or two, are going to be idiots and take it out faster than they can maintain for 15 minutes. You guys are in high school, you have the worst sense of pace known to man. Don't be thrown off by this tomfoolery. Go out slow. Keep everyone in your sight for 8 laps then start reeling them in or get into the pack. From here just wait with them and try to get bunch up as much as possible. If one or two people move ahead to the front and escape, let them. You don't have to be top 3, nor top 5 for that matter.