The final three weeks of the Louisiana high school football regular season are upon us, and On3 is tracking scores from the biggest games around the state. Six showdowns between ranked teams are set for the next few days, including a huge one between No. 1 Ruston and No. 7 Alexandria. Follow along below: The On3 Massey Ratings — which were officially used during the BCS era and have generated college high school sports team rankings since 1995 — rank sports teams by analyzing game outcomes, strength of schedule, and margin of victory. CLICK HERE to watch your high school’s games on NFHS Networ…