The Ranking Score allows you to quickly compare your ranking performance from your previous ranking report, so that you know if your overall ranking has going up or down.
For example, if you cheak web ranking for top 30 positions. If your web site rank on #1 position, it will score you 30 points. If your web site rank on #10 position, you score 20 positions. If your web site rank #30 position, you got 1 points.
Then the program will add all the points together with a special formular to give you a Ranking Score.
If your ranking score going up, it means that you have more top ranking pages. If your ranking scroe going down, it means that your overall ranking is going down.