I did it for my character as the Inquisitor and that pushed up my score a lot (the Beware the Monks of Cool, Yo! score shoots up when you have to factor in that she's carrying a weapon nearly all the time, wearing a lot of leather and all the mage outfits are a variation on a trenchcoat. There should be an option to say if this is usual for the setting)
You clearly think too much. 
The whole test is kitchen psychology at its best. Like it said for mine "Siha is not a character, Siha is you. (blahblahblah) Take care not to get too close to her. Maybe she's you as you wish you were, or maybe you're just afraid no one will like her and are trying to give her a free ride. Have some confidence in your writing! Siha is a good character. Give her room to be herself before you stifle her."
The last bit seems to be the same for everybody. And in my case it even does not fit the first bit. In general, it bases the assumption how similar your character is to you on a few questions at the beginning (all basically "is she like you?") and the assumption that you, in real life, are not too special.
And it's a horoscope level; "maybe she's as you wish you were, or maybe you're just afraid no one will like her" (the two ideas are not even logically connected in any way, but the sentence still implies a controversy by putting "or") is hardly better than "tomorrow it might rain or it might not", "maybe you will meet a stranger who will say something to you", or "eventually everything might turn out right if you take the appropriate actions now or in the future".
This test should have considered a lot of things to be useful. The best it can do for you is to give you a list of things a Mary Sue should be, so you can try to incorporate (or avoid) as many of them as possible. 
Edit:
Billy is only a little like you. He may be popular, or he may not, but no matter what he's impossible to ignore; he stands out... just the way you always wanted to. He may have sometimes thought that he was special, or destined for greater things, but probably dismissed the idea as a fantasy. He's had more than his fair share of hard knocks, and probably spends more time than he ought moaning about it. And you've been pretty kind to him, always ready to intercede on his behalf and give him a nice easy victory. You may have let yourself get a little too close to Billy. Maybe he's you as you wish you were, or maybe you're just afraid no one will like him and are trying to give him a free ride. Have some confidence in your writing! Billy is a good character. Give him room to be himself before you stifle him.
Ehehehehe... Example B.