How to Build a Ap Human Calculator

function predictAPHumanGeoScore(mcCorrect, frqScores) {
  const mcScore = Math.min(mcCorrect * 0.8333, 50);
  const frRaw = frqScores.reduce((sum, s) => sum + Math.min(s, 7), 0);
  const frScore = frRaw * 2.381; // scale 21 raw to 50 max
  const composite = Math.round(mcScore + frScore);

  const cuts = { 5: 73, 4: 58, 3: 44, 2: 31 };
  let apScore = 1;
  for (const [score, min] of Object.entries(cuts).sort((a, b) => b[1] - a[1])) {
    if (composite >= min) { apScore = parseInt(score); break; }
  }

  return {
    composite, maxComposite: 100,
    breakdown: { mc: Math.round(mcScore * 10) / 10, fr: Math.round(frScore * 10) / 10 },
    apScore
  };
  }