See this thread for more information:
http://forum.battlemaster.org/index.php/topic,2910.msg66411.htmlIn a nutshell, your score is not your skill, it's where your skill relative to the other characters on the continent. The character with the best spellcasting skill gets a score of 100 (even if their actual skill is maybe 20%), the lowest get zero, and everybody else is ranked in-between.
For spellcasting, I would hazard a guess and say since almost nobody has any spellcasting experience, your rank will be a top rank if you have any exposure to magic, and random otherwise.